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All questions of April Week 3 for NEET Exam
A truck has a velocity of 2 m /s at time t=0. It accelerates at 2 m / s2 on seeing police .What is its velocity in m/s at a time of 2 sec- a)6
- b)7
- c)3
- d)4
Correct answer is option 'A'. Can you explain this answer?
A truck has a velocity of 2 m /s at time t=0. It accelerates at 2 m / s2 on seeing police .What is its velocity in m/s at a time of 2 sec
a)
6
b)
7
c)
3
d)
4
|
Naina Sharma answered |
Explanation:
Initial velocity u = 2 m/s
final velocity = v m/s
Time duration = final time - initial time = 2-0 = 2 s
acceleration a = 2 m/s2
We know,
v = u + at
=> v = 2+2x2
=> v = 6 m/s
If the position- time graph is a straight line parallel to the time axis- a)The velocity is zero
- b)The velocity is decreasing
- c)The velocity is increasing
- d)The velocity is constant but non zero
Correct answer is option 'A'. Can you explain this answer?
If the position- time graph is a straight line parallel to the time axis
a)
The velocity is zero
b)
The velocity is decreasing
c)
The velocity is increasing
d)
The velocity is constant but non zero
|
|
Neha Sharma answered |
Explanation:Position-time graph of horizontal straight line parallel to time axis represents that the position of the body does not changes with the passage of time. So it represents the rest state of motion.It means velocity of object is zero.
An object is said to be in uniform motion in a straight line if its displacement- a)is decreasing in equal intervals of time
- b)is increasing in equal intervals of time
- c)is equal in equal intervals of time.
- d)is equal in not equal intervals of time.
Correct answer is option 'C'. Can you explain this answer?
An object is said to be in uniform motion in a straight line if its displacement
a)
is decreasing in equal intervals of time
b)
is increasing in equal intervals of time
c)
is equal in equal intervals of time.
d)
is equal in not equal intervals of time.
|
Mira Joshi answered |
Explanation:Uniform motion is the kind of motion in which a body covers equal displacement in equal intervals of time. It does not matter how small the time intervals are, as long as the displacements covered are equal.
If a body is involved in rectilinear motion and the motion is uniform, then the acceleration of the body must be zero.
Which of the following organisms have been placed under kingdom Protista?- a)Chrysophytes and dinoflagellates
- b)Euglenoids
- c)Slime moulds and protozoans
- d)All of these
Correct answer is option 'D'. Can you explain this answer?
Which of the following organisms have been placed under kingdom Protista?
a)
Chrysophytes and dinoflagellates
b)
Euglenoids
c)
Slime moulds and protozoans
d)
All of these
|
|
Mira Joshi answered |
The kingdom protista has been broadly divided into three main groups:
(i) Photosynthetic Protists (Protistan Algae) e.g., Dinoflagellates, Chrysophytes and Euglenoids
(ii) Consumer-Decomposer Protists(Slime Moulds)
(iii) Protozoan Protists
Euglenoids are Euglena like unicellular glagellates which posess pellicle instead of cell wall. Chrysophytes include diatoms and desmids. They belong to the division Chrysophyta/Bacillariophyta. The dinoflagellates belong to division Pyrrophyta and class Dinophyceae. Slime moulds possess the characters of both animals and fungi and , therefore they are commonly called fungus-animals.
(i) Photosynthetic Protists (Protistan Algae) e.g., Dinoflagellates, Chrysophytes and Euglenoids
(ii) Consumer-Decomposer Protists(Slime Moulds)
(iii) Protozoan Protists
Euglenoids are Euglena like unicellular glagellates which posess pellicle instead of cell wall. Chrysophytes include diatoms and desmids. They belong to the division Chrysophyta/Bacillariophyta. The dinoflagellates belong to division Pyrrophyta and class Dinophyceae. Slime moulds possess the characters of both animals and fungi and , therefore they are commonly called fungus-animals.
The dimensional formula for acceleration is- a)[LT2]
- b)[LT-2]
- c)[L2T]
- d)[L2T2]
Correct answer is option 'B'. Can you explain this answer?
The dimensional formula for acceleration is
a)
[LT2]
b)
[LT-2]
c)
[L2T]
d)
[L2T2]
|
Upasana Bose answered |
Acceleration is the rate of change of velocity of an object with respect to time. It is a vector quantity and its direction is the same as that of the change in velocity. The dimensional formula for acceleration is given by LT-2, where L stands for length and T stands for time.
Explanation:
Acceleration can be mathematically represented as:
a = (v-u)/t
where a is the acceleration, v is the final velocity, u is the initial velocity and t is the time taken to change the velocity.
Dimensional formula for velocity is LT-1, as velocity is distance travelled per unit time. Therefore, the dimensional formula for acceleration can be obtained by dividing the dimensional formula for velocity by the dimensional formula for time.
a = (v-u)/t = (LT-1 - LT-1)/T = LT-2
Hence, the correct answer is option B, LT-2.
Conclusion:
In conclusion, the dimensional formula for acceleration is LT-2, which means that acceleration is directly proportional to length and inversely proportional to time squared. It is important to understand the dimensional formula of a physical quantity as it helps in formulating equations and understanding the physical nature of the quantity.
Explanation:
Acceleration can be mathematically represented as:
a = (v-u)/t
where a is the acceleration, v is the final velocity, u is the initial velocity and t is the time taken to change the velocity.
Dimensional formula for velocity is LT-1, as velocity is distance travelled per unit time. Therefore, the dimensional formula for acceleration can be obtained by dividing the dimensional formula for velocity by the dimensional formula for time.
a = (v-u)/t = (LT-1 - LT-1)/T = LT-2
Hence, the correct answer is option B, LT-2.
Conclusion:
In conclusion, the dimensional formula for acceleration is LT-2, which means that acceleration is directly proportional to length and inversely proportional to time squared. It is important to understand the dimensional formula of a physical quantity as it helps in formulating equations and understanding the physical nature of the quantity.
The position of an object moving in a straight line can be specified with reference to- a)another straight line
- b)an arbitrary star
- c)a conveniently chosen origin
- d)a triangle
Correct answer is option 'C'. Can you explain this answer?
The position of an object moving in a straight line can be specified with reference to
a)
another straight line
b)
an arbitrary star
c)
a conveniently chosen origin
d)
a triangle
|
Pooja Shah answered |
Explanation:To describe motion along a straight line, we can choose an axis, say X-axis, so that it coincides with the path of the object. We then measure the position of the object with reference to a conveniently chosen origin, say O, Positions to the right of O are taken as positive and to the left of O, as negative.
Path length is a- a)vector
- b)derived unit
- c)scalar
- d)tensor
Correct answer is option 'C'. Can you explain this answer?
Path length is a
a)
vector
b)
derived unit
c)
scalar
d)
tensor
|
Om Desai answered |
Explanation:Path length has no particular direction and it depends upon the path chosen to reach the destination where displacement of the destination is absolute no matter what path is used to get there. So it is scaler.
A body moving with uniform acceleration has a velocity of 12.0 cm/s in the positive x direction when its x coordinate is 3.00 cm. If its x coordinate 2.00 s later is -5.00 cm, what is the magnitude of its acceleration in cm/s2 ?
- a)-16.0 cm/s2
- b)-14.0 cm/s2
- c)-12.0 cm/s2
- d)-18.0 cm/s2
Correct answer is option 'A'. Can you explain this answer?
A body moving with uniform acceleration has a velocity of 12.0 cm/s in the positive x direction when its x coordinate is 3.00 cm. If its x coordinate 2.00 s later is -5.00 cm, what is the magnitude of its acceleration in cm/s2 ?
a)
-16.0 cm/s2
b)
-14.0 cm/s2
c)
-12.0 cm/s2
d)
-18.0 cm/s2
|
Rashmi Saxena answered |
DV=DX/dt=-5-3=-8/2=-4 Da=-dv/dt=-4-12=-16 we are not dividing with t because we have already found the displacement change at that time
The average acceleration a over a time interval is defined as- a)average velocity divided by the time interval
- b)the change of velocity divided by the time interval
- c)average speed divided by the time interval
- d)average displacement divided by the time interval
Correct answer is option 'B'. Can you explain this answer?
The average acceleration a over a time interval is defined as
a)
average velocity divided by the time interval
b)
the change of velocity divided by the time interval
c)
average speed divided by the time interval
d)
average displacement divided by the time interval
|
Sai Mishra answered |
Explanation:
Acceleration is the rate of change of velocity with time.It is a vector quantity.
Average acceleration is the change in velocity per unit time over an interval of time.
Let initial velocity at time interval t1 is v1 and final velocity at time interval t2 is v2 Then
Path length is defined as.- a)the total length of the path traversed by an object
- b)the distance from origin to maximum point
- c)distance from origin to origin.
- d)the distance from origin to minimum point
Correct answer is option 'A'. Can you explain this answer?
Path length is defined as.
a)
the total length of the path traversed by an object
b)
the distance from origin to maximum point
c)
distance from origin to origin.
d)
the distance from origin to minimum point
|
Arindam Unni answered |
Explanation:Path length is defined as the total length of the path traversed by an object.
Unlike displacement, which is the total distance an object travels from a starting point, path length is the total distance travelled, regardless of where it travelled.
Choose the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively and its molecular mass is 160.- a)FeO
- b)Fe3O4
- c)Fe2O3
- d)FeO2
Correct answer is option 'C'. Can you explain this answer?
Choose the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively and its molecular mass is 160.
a)
FeO
b)
Fe3O4
c)
Fe2O3
d)
FeO2
|
|
Riya Banerjee answered |
For element Fe, mole of atoms = 69.9/56 = 1.25
For element O, Mole of atoms = 30.1/16 = 1.88
Mole ratio of Fe = 1.25/1.25 = 1
Mole ratio of O = 1.88/1.25 = 1.5
Simplest whole number ratio of Fe and O = 2, 3
Empirical formula of compoimd = Fe2O3
Molecular mass of Fe2O3 = 160
Molecular formula = Fe2O3
For element O, Mole of atoms = 30.1/16 = 1.88
Mole ratio of Fe = 1.25/1.25 = 1
Mole ratio of O = 1.88/1.25 = 1.5
Simplest whole number ratio of Fe and O = 2, 3
Empirical formula of compoimd = Fe2O3
Molecular mass of Fe2O3 = 160
Molecular formula = Fe2O3
Diatomaceous earth is used for all except- a)polishing
- b)filtration of oils and syrups
- c)making sound and fire proof rooms
- d)biogas production.
Correct answer is option 'D'. Can you explain this answer?
Diatomaceous earth is used for all except
a)
polishing
b)
filtration of oils and syrups
c)
making sound and fire proof rooms
d)
biogas production.
|
|
Mira Joshi answered |
Diatomite deposits are often accompanied by petroleum fields. Much of the petroleum of today is probably due to decayed bodies of the past diatoms. Diatomite is porous and chemically inert. It is, therefore, used in filtration of sugar, alcohols, oil, syrups and antibiotics. Diatomaceous earth is used to make sound proofrooms. Diatomite is employed as a cleaning agent in tooth pastes and metal polishes.
A compound contains two elements 'x' and 'Y' in the ratio of 50% each. Atomic mass of 'x' is 20 and 'Y' is 40. What can be its simplest formula?- a)XY
- b)X2Y
- c)XY2
- d)X2Y3
Correct answer is option 'B'. Can you explain this answer?
A compound contains two elements 'x' and 'Y' in the ratio of 50% each. Atomic mass of 'x' is 20 and 'Y' is 40. What can be its simplest formula?
a)
XY
b)
X2Y
c)
XY2
d)
X2Y3
|
Gayatri Singh answered |
Explanation:
To determine the simplest formula of a compound, we need to find the ratio of the elements present in the compound. In this case, the compound contains two elements, X and Y, in a ratio of 50% each.
Step 1: Determine the atomic masses of X and Y
The atomic mass of X is given as 20, and the atomic mass of Y is given as 40.
Step 2: Convert the atomic masses to moles
To find the ratio of the elements, we need to convert the atomic masses to moles by dividing them by their respective atomic masses.
Moles of X = 20/20 = 1
Moles of Y = 40/40 = 1
Step 3: Determine the simplest ratio of X and Y
Since the ratio of X and Y is 1:1, the simplest ratio can be expressed as X1Y1, which can be simplified to XY.
Step 4: Write the simplest formula
The simplest formula of the compound is XY.
Therefore, the correct answer is option B, XY.
Note: It is important to note that the ratio of elements in a compound is determined by the number of moles, not the percentage. The 50% each mentioned in the question is used to determine the ratio of the elements, but the ratio is expressed in moles, not percentages.
To determine the simplest formula of a compound, we need to find the ratio of the elements present in the compound. In this case, the compound contains two elements, X and Y, in a ratio of 50% each.
Step 1: Determine the atomic masses of X and Y
The atomic mass of X is given as 20, and the atomic mass of Y is given as 40.
Step 2: Convert the atomic masses to moles
To find the ratio of the elements, we need to convert the atomic masses to moles by dividing them by their respective atomic masses.
Moles of X = 20/20 = 1
Moles of Y = 40/40 = 1
Step 3: Determine the simplest ratio of X and Y
Since the ratio of X and Y is 1:1, the simplest ratio can be expressed as X1Y1, which can be simplified to XY.
Step 4: Write the simplest formula
The simplest formula of the compound is XY.
Therefore, the correct answer is option B, XY.
Note: It is important to note that the ratio of elements in a compound is determined by the number of moles, not the percentage. The 50% each mentioned in the question is used to determine the ratio of the elements, but the ratio is expressed in moles, not percentages.
How do slime moulds typically behave under favorable conditions?- a)They form fruiting bodies
- b)They differentiate to form fruiting bodies
- c)They disperse spores by air currents
- d)They engulf organic material
Correct answer is option 'D'. Can you explain this answer?
How do slime moulds typically behave under favorable conditions?
a)
They form fruiting bodies
b)
They differentiate to form fruiting bodies
c)
They disperse spores by air currents
d)
They engulf organic material
|
Ambition Institute answered |
Slime moulds, under favorable conditions, move along decaying twigs and leaves engulfing organic material. This behavior allows them to thrive by feeding on organic matter and growing as a result.
. During unfavourable conditions, the plasmodium differentiates and forms fruiting bodies bearing spores at their tips. The spores possess true walls. They are extremely resistant and survive for many years, even under adverse conditions. The spores are dispersed by air currents.
Protozoans obtain their food as- a)predators or parasites
- b)chemosynthesizers
- c) heterotrophs
- d)Both (A) and (C)
Correct answer is option 'D'. Can you explain this answer?
Protozoans obtain their food as
a)
predators or parasites
b)
chemosynthesizers
c)
heterotrophs
d)
Both (A) and (C)
|
Ciel Knowledge answered |
All protozoans are heterotrophs and live as predators or parasites.
Protista differs from monera in having- a)Cell wall
- b)Autotrophic nutrition
- c) flagella
- d)Nuclear membrane
Correct answer is option 'D'. Can you explain this answer?
Protista differs from monera in having
a)
Cell wall
b)
Autotrophic nutrition
c)
flagella
d)
Nuclear membrane
|
|
Ciel Knowledge answered |
- Correct Answer: D: Nuclear membrane
- Explanation:
- Protista is a kingdom of eukaryotic organisms, which means they have a true nucleus enclosed within a nuclear membrane.
- Monera, on the other hand, are prokaryotic organisms lacking a true nucleus and nuclear membrane.
- The presence of a nuclear membrane is a key characteristic that distinguishes Protista from Monera.
This distinction is crucial in understanding the fundamental differences between these two groups of organisms.
- Explanation:
- Protista is a kingdom of eukaryotic organisms, which means they have a true nucleus enclosed within a nuclear membrane.
- Monera, on the other hand, are prokaryotic organisms lacking a true nucleus and nuclear membrane.
- The presence of a nuclear membrane is a key characteristic that distinguishes Protista from Monera.
This distinction is crucial in understanding the fundamental differences between these two groups of organisms.
The empirical formula of a compound is CH2O2.What could be its molecular formula?- a)C2H2O2
- b)C2H2O4
- c)C2H4O4
- d)CH4O4
Correct answer is option 'C'. Can you explain this answer?
The empirical formula of a compound is CH2O2.What could be its molecular formula?
a)
C2H2O2
b)
C2H2O4
c)
C2H4O4
d)
CH4O4
|
|
Raghav Bansal answered |
Since empirical formula is multiplied by n to get molecular formula.
CH2O2 will give only C2H4O4 as its molecular formula. (CH2O2)n where n = 1, 2, 3,... etc.
CH2O2 will give only C2H4O4 as its molecular formula. (CH2O2)n where n = 1, 2, 3,... etc.
For motion with uniform acceleration, v-t graph is- a)a straight line parallel to the time axis
- b)a straight line perpendicular to the time axis
- c)a straight line inclined to the time axis.
- d)an ellipse
Correct answer is option 'C'. Can you explain this answer?
For motion with uniform acceleration, v-t graph is
a)
a straight line parallel to the time axis
b)
a straight line perpendicular to the time axis
c)
a straight line inclined to the time axis.
d)
an ellipse
|
Swara Bose answered |
Explanation:When velocity – time graph is plotted for an object moving with uniform acceleration, the slope of the graph is a straight line.
Displacement is a- a)Hector
- b)Vector
- c)Scalar
- d)Tensor
Correct answer is option 'B'. Can you explain this answer?
Displacement is a
a)
Hector
b)
Vector
c)
Scalar
d)
Tensor
|
Maheshwar Chawla answered |
Explanation:Displacement vector is a vector which gives the position of a point with reference to a point other than the origin of the coordinate system.
A slide under microscope shows following features:
(i) Unicellularity
(ii) Well defined nucleus
(iii) Biflagellate-one flagellum lying longitudinally and the other transversely.
What would you identify it as?- a)Protozoan
- b)Bacterium
- c)Euglenoid
- d)Dinoflagellate
Correct answer is option 'D'. Can you explain this answer?
A slide under microscope shows following features:
(i) Unicellularity
(ii) Well defined nucleus
(iii) Biflagellate-one flagellum lying longitudinally and the other transversely.
What would you identify it as?
(i) Unicellularity
(ii) Well defined nucleus
(iii) Biflagellate-one flagellum lying longitudinally and the other transversely.
What would you identify it as?
a)
Protozoan
b)
Bacterium
c)
Euglenoid
d)
Dinoflagellate
|
|
Mira Joshi answered |
Dinoflagellates are basically unicellular, motile and biflagellate, golden brown, photosynthetic protists. The two flagella are different (heterokont), one transverse flagellum and other longitudinal flagellum.The longitudinal flagellum is narrow, smooth, directed posteriorly and lies in the sulcys. The transverse flagellum is ribbon-like and lies in the cingulum or annulus. The two types of flagella beat in different directions. A well defined nucleus is present, which has been named as mesokaryon.
Which of the following statements about Euglena is correct?- a)Euglena is a flagellate organism.
- b)Euglena when placed in continuous darkness, loses its photosynthetic activity and dies.
- c)The pigments of Euglena are quite different from those of green plants.
- d)Euglena is a marine protist.
Correct answer is option 'A'. Can you explain this answer?
Which of the following statements about Euglena is correct?
a)
Euglena is a flagellate organism.
b)
Euglena when placed in continuous darkness, loses its photosynthetic activity and dies.
c)
The pigments of Euglena are quite different from those of green plants.
d)
Euglena is a marine protist.
|
|
Mira Joshi answered |
Euglenoids are unicellular flagellate protists commonly found in fresh water ponds, pools and moist mud. They lack cellulose cell wall. The body is covered bv thin and flexible pellicle (= periplast). The pellicle has oblique but parallel stripes called myonemes. The euglenolds have two flagella, usually one long and one short. Though the euglenoids are photosynthetic in the presence of light, when deprived of sunlight they behave like heterotrophs by predating on smaller organisms (holozoic) or feeding on organic remains (saprobic). Such a mode of nutrition is called mixotrophic (i.e., a mix of holophytic + saprobic or holozoic). Photosynthetic pigments of euglenoids are identical to those present in higher plants, e.g. chl a and chl b.
The cell wall is composed of two thin overlapping shells which fit together like a soap case, in- a)desmids
- b)diatoms
- c)dinoflagellates
- d)slime moulds.
Correct answer is option 'B'. Can you explain this answer?
The cell wall is composed of two thin overlapping shells which fit together like a soap case, in
a)
desmids
b)
diatoms
c)
dinoflagellates
d)
slime moulds.
|
|
Mira Joshi answered |
The body of diatoms is covered by a transparent ' siliceous shell (silica deposited in cell wall) known as frustule. The frustule is made of two valves, epitheca and hypotheca. The two valves fit together like a soap box. The frustule possesses very fine markings, pits, pores and ridges.
A gas has molecular formula (CH)n. If vapour density of the gas is 39, what should be the formula of the compound?- a)C3H3
- b)C4H4
- c)C2H2
- d)C6H6
Correct answer is option 'D'. Can you explain this answer?
A gas has molecular formula (CH)n. If vapour density of the gas is 39, what should be the formula of the compound?
a)
C3H3
b)
C4H4
c)
C2H2
d)
C6H6
|
|
Riya Banerjee answered |
Mol. wt. = 2 x V.D. = 2 x 39 = 78
(CH)n = (13)n or 13 x n = 78
n = 78/13 = 6
∴ Molecular formula = C6H6
(CH)n = (13)n or 13 x n = 78
n = 78/13 = 6
∴ Molecular formula = C6H6
Assertion (A): All protozoans are heterotrophs and primarily live as predators or parasites. Reason (R): Protozoans possess chloroplasts that allow them to perform photosynthesis.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'C'. Can you explain this answer?
Assertion (A): All protozoans are heterotrophs and primarily live as predators or parasites.
Reason (R): Protozoans possess chloroplasts that allow them to perform photosynthesis.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
|
|
Janani Yadav answered |
Understanding Protozoans
Protozoans are a diverse group of single-celled organisms known for their varied lifestyles and nutritional methods.
Assertion (A): All protozoans are heterotrophs
- Protozoans are primarily heterotrophic, meaning they obtain their food by consuming organic matter.
- They often function as predators, feeding on bacteria, algae, and other small organisms.
- Some protozoans can also be parasitic, deriving nutrients from a host organism.
Reason (R): Protozoans possess chloroplasts that allow them to perform photosynthesis
- Most protozoans do not possess chloroplasts and, therefore, cannot perform photosynthesis.
- While some photosynthetic organisms, like certain algae, may share characteristics with protozoans, they are not classified as true protozoans.
- The presence of chloroplasts is characteristic of plants and certain algae, not protozoans.
Conclusion: Why Option 'C' is Correct
- The assertion is true: all protozoans are indeed heterotrophs.
- The reason is false: protozoans do not have chloroplasts and cannot perform photosynthesis.
- Therefore, the correct answer is option 'C' - Assertion is true, but Reason is false.
In summary, understanding the nutritional modes of protozoans clarifies their ecological role, while recognizing the limitations of their classification helps distinguish them from photosynthetic organisms.
Protozoans are a diverse group of single-celled organisms known for their varied lifestyles and nutritional methods.
Assertion (A): All protozoans are heterotrophs
- Protozoans are primarily heterotrophic, meaning they obtain their food by consuming organic matter.
- They often function as predators, feeding on bacteria, algae, and other small organisms.
- Some protozoans can also be parasitic, deriving nutrients from a host organism.
Reason (R): Protozoans possess chloroplasts that allow them to perform photosynthesis
- Most protozoans do not possess chloroplasts and, therefore, cannot perform photosynthesis.
- While some photosynthetic organisms, like certain algae, may share characteristics with protozoans, they are not classified as true protozoans.
- The presence of chloroplasts is characteristic of plants and certain algae, not protozoans.
Conclusion: Why Option 'C' is Correct
- The assertion is true: all protozoans are indeed heterotrophs.
- The reason is false: protozoans do not have chloroplasts and cannot perform photosynthesis.
- Therefore, the correct answer is option 'C' - Assertion is true, but Reason is false.
In summary, understanding the nutritional modes of protozoans clarifies their ecological role, while recognizing the limitations of their classification helps distinguish them from photosynthetic organisms.
In a distance - time graph, motion of two cars A & B is plotted in the form of a Straight line. If the line on the graph is steeper for A as compared to B, What can you infer from the graph?- a)Speed of A is greater than speed of B
- b)Distance travelled by A is greater than distance travelled by B
- c)Speed of B is greater than speed of A
- d)Distance travelled by B is greater than distance travelled by A
Correct answer is option 'A'. Can you explain this answer?
In a distance - time graph, motion of two cars A & B is plotted in the form of a Straight line. If the line on the graph is steeper for A as compared to B, What can you infer from the graph?
a)
Speed of A is greater than speed of B
b)
Distance travelled by A is greater than distance travelled by B
c)
Speed of B is greater than speed of A
d)
Distance travelled by B is greater than distance travelled by A
|
Akanksha Menon answered |
Understanding the Distance-Time Graph
In a distance-time graph, the slope of the line represents the speed of the object. The steeper the slope, the greater the speed. Let's analyze the information given about cars A and B.
Key Observations
- The line representing car A is steeper than that of car B.
- This indicates that car A covers more distance in the same amount of time compared to car B.
Implications of a Steeper Line
- Speed Comparison: A steeper line corresponds to a higher speed. Since car A's line is steeper, it confirms that:
- Speed of A is greater than speed of B (Correct answer: option 'A').
- Distance Travelled: While the distance travelled can be inferred from the graph, the steepness specifically indicates speed rather than total distance. Both cars could have travelled the same distance if observed over a longer period, but the slope is a direct measure of their speeds at any given instant.
Conclusion
From the given graph, it is clear that:
- Speed of A is greater than speed of B.
Thus, option 'A' is the correct inference from the distance-time graph. Understanding the relationship between slope and speed is crucial in analyzing motion in physics.
In a distance-time graph, the slope of the line represents the speed of the object. The steeper the slope, the greater the speed. Let's analyze the information given about cars A and B.
Key Observations
- The line representing car A is steeper than that of car B.
- This indicates that car A covers more distance in the same amount of time compared to car B.
Implications of a Steeper Line
- Speed Comparison: A steeper line corresponds to a higher speed. Since car A's line is steeper, it confirms that:
- Speed of A is greater than speed of B (Correct answer: option 'A').
- Distance Travelled: While the distance travelled can be inferred from the graph, the steepness specifically indicates speed rather than total distance. Both cars could have travelled the same distance if observed over a longer period, but the slope is a direct measure of their speeds at any given instant.
Conclusion
From the given graph, it is clear that:
- Speed of A is greater than speed of B.
Thus, option 'A' is the correct inference from the distance-time graph. Understanding the relationship between slope and speed is crucial in analyzing motion in physics.
The distance traversed in first 10 sec is:
The area under the velocity-time curve between times t1 and t2 is equal to the.- a)average velocity of the object during that interval of time
- b)path length of the object during that interval of time
- c)velocity of the object during that interval of time
- d)displacement of the object during that interval of time
Correct answer is option 'D'. Can you explain this answer?
The area under the velocity-time curve between times t1 and t2 is equal to the.
a)
average velocity of the object during that interval of time
b)
path length of the object during that interval of time
c)
velocity of the object during that interval of time
d)
displacement of the object during that interval of time
|
|
Swara Bose answered |
Explanation:
The area under the velocity-time curve represents the displacement of the object during that interval of time. This can be explained using the basic concept of calculus and the relationship between velocity and displacement.
Understanding the velocity-time curve:
The velocity-time curve represents how the velocity of an object changes over time. The velocity is plotted on the y-axis, and time is plotted on the x-axis. The shape of the curve depends on the motion of the object. For example, if the object is moving with constant velocity, the curve will be a straight line parallel to the x-axis. If the object is accelerating or decelerating, the curve will be curved.
Using calculus to find displacement:
To find the displacement of an object during a given interval of time, we can use calculus and integrate the velocity function with respect to time. Integration represents the area under the curve.
Explanation of the options:
a) Average velocity of the object during that interval of time: The average velocity is calculated by dividing the total displacement by the total time. It is not directly related to the area under the velocity-time curve.
b) Path length of the object during that interval of time: The path length is the total distance traveled by the object. It is not directly related to the area under the velocity-time curve.
c) Velocity of the object during that interval of time: The velocity of the object at a specific time can be determined from the velocity-time curve. However, the area under the curve does not represent the instantaneous velocity at any particular time.
d) Displacement of the object during that interval of time: The area under the velocity-time curve represents the change in displacement of the object during that interval of time. By integrating the velocity function, we can find the total area under the curve, which gives us the displacement.
Conclusion:
The area under the velocity-time curve between times t1 and t2 represents the displacement of the object during that interval of time. This is because integration of the velocity function gives us the total area under the curve, which represents the change in displacement.
The area under the velocity-time curve represents the displacement of the object during that interval of time. This can be explained using the basic concept of calculus and the relationship between velocity and displacement.
Understanding the velocity-time curve:
The velocity-time curve represents how the velocity of an object changes over time. The velocity is plotted on the y-axis, and time is plotted on the x-axis. The shape of the curve depends on the motion of the object. For example, if the object is moving with constant velocity, the curve will be a straight line parallel to the x-axis. If the object is accelerating or decelerating, the curve will be curved.
Using calculus to find displacement:
To find the displacement of an object during a given interval of time, we can use calculus and integrate the velocity function with respect to time. Integration represents the area under the curve.
Explanation of the options:
a) Average velocity of the object during that interval of time: The average velocity is calculated by dividing the total displacement by the total time. It is not directly related to the area under the velocity-time curve.
b) Path length of the object during that interval of time: The path length is the total distance traveled by the object. It is not directly related to the area under the velocity-time curve.
c) Velocity of the object during that interval of time: The velocity of the object at a specific time can be determined from the velocity-time curve. However, the area under the curve does not represent the instantaneous velocity at any particular time.
d) Displacement of the object during that interval of time: The area under the velocity-time curve represents the change in displacement of the object during that interval of time. By integrating the velocity function, we can find the total area under the curve, which gives us the displacement.
Conclusion:
The area under the velocity-time curve between times t1 and t2 represents the displacement of the object during that interval of time. This is because integration of the velocity function gives us the total area under the curve, which represents the change in displacement.
Which of the following kingdoms has no well define boundaries?- a)Monera
- b)Protista
- c)Fungi
- d)Metaphyta and Metazoa
Correct answer is option 'B'. Can you explain this answer?
Which of the following kingdoms has no well define boundaries?
a)
Monera
b)
Protista
c)
Fungi
d)
Metaphyta and Metazoa
|
|
Mira Joshi answered |
Although all single-celled eukaryotes (except some unicellular algae e.g., Chlamydomonas, Chlorella etc., fungi e.g., Yeasta and animals, which are placed in their respective kingdoms along with their closely related multicellular organisms) are placed in kingdom Protista, yet its boundaries are not well defined.
Slime moulds are- a)photosynthetic protists
- b)saprophytic protists
- c)both (a) and (b)
- d)none of these
Correct answer is option 'B'. Can you explain this answer?
Slime moulds are
a)
photosynthetic protists
b)
saprophytic protists
c)
both (a) and (b)
d)
none of these
|
Ayush Chatterjee answered |
Slime moulds as saprophytic protists
Slime moulds are categorized as saprophytic protists because they obtain their nutrients by decomposing organic matter. They play a crucial role in breaking down dead plant material, fungi, and bacteria in the environment. This decomposition process is essential for recycling nutrients back into the ecosystem.
Feeding mechanism of slime moulds
Slime moulds feed by engulfing their food source, which consists of bacteria, spores, and other organic material. They secrete enzymes to break down the organic matter into simpler compounds that can be absorbed by the organism. This process of decomposition helps in nutrient cycling and maintaining the balance of the ecosystem.
Life cycle of slime moulds
Slime moulds have a unique life cycle that involves two main stages: the vegetative stage and the reproductive stage. During the vegetative stage, the slime mould exists as a single-celled organism or a mass of cells. When conditions are favorable, they form spore-bearing structures for reproduction. These spores are dispersed into the environment, where they can germinate and start a new life cycle.
Ecological significance of slime moulds
Slime moulds play a crucial role in the ecosystem as decomposers, helping to break down dead organic matter and recycle nutrients. They contribute to the health of the environment by ensuring that essential nutrients are returned to the soil for use by plants and other organisms. Their feeding mechanism and life cycle help maintain the balance of the ecosystem and support biodiversity.
In conclusion, slime moulds are saprophytic protists that play a vital role in nutrient cycling and ecosystem health. Their feeding mechanism, life cycle, and ecological significance highlight their importance in maintaining a balanced and healthy environment.
Slime moulds are categorized as saprophytic protists because they obtain their nutrients by decomposing organic matter. They play a crucial role in breaking down dead plant material, fungi, and bacteria in the environment. This decomposition process is essential for recycling nutrients back into the ecosystem.
Feeding mechanism of slime moulds
Slime moulds feed by engulfing their food source, which consists of bacteria, spores, and other organic material. They secrete enzymes to break down the organic matter into simpler compounds that can be absorbed by the organism. This process of decomposition helps in nutrient cycling and maintaining the balance of the ecosystem.
Life cycle of slime moulds
Slime moulds have a unique life cycle that involves two main stages: the vegetative stage and the reproductive stage. During the vegetative stage, the slime mould exists as a single-celled organism or a mass of cells. When conditions are favorable, they form spore-bearing structures for reproduction. These spores are dispersed into the environment, where they can germinate and start a new life cycle.
Ecological significance of slime moulds
Slime moulds play a crucial role in the ecosystem as decomposers, helping to break down dead organic matter and recycle nutrients. They contribute to the health of the environment by ensuring that essential nutrients are returned to the soil for use by plants and other organisms. Their feeding mechanism and life cycle help maintain the balance of the ecosystem and support biodiversity.
In conclusion, slime moulds are saprophytic protists that play a vital role in nutrient cycling and ecosystem health. Their feeding mechanism, life cycle, and ecological significance highlight their importance in maintaining a balanced and healthy environment.
0.48 g of a sample of a compound containing boron and oxygen contains 0.192 g of boron and 0.288 gof oxygen. What will be the percentage composition of the compound?- a)60% and 40% Band O respectively
- b)40% and 60% Band O respectively
- c)30% and 70% B and O respectively
- d)70% and 30% B and O respectively
Correct answer is option 'B'. Can you explain this answer?
0.48 g of a sample of a compound containing boron and oxygen contains 0.192 g of boron and 0.288 gof oxygen. What will be the percentage composition of the compound?
a)
60% and 40% Band O respectively
b)
40% and 60% Band O respectively
c)
30% and 70% B and O respectively
d)
70% and 30% B and O respectively
|
Lavanya Menon answered |
Mass of compound taken = 0.48 g
Mass of boron in sample = 0.192 g
Mass of oxygen in sample = 0.288 g
Percentage of B = 0.192/0.48 x 100 = 40%
Percentage of O = 0.288/0.48 x 100 = 60%
Mass of boron in sample = 0.192 g
Mass of oxygen in sample = 0.288 g
Percentage of B = 0.192/0.48 x 100 = 40%
Percentage of O = 0.288/0.48 x 100 = 60%
In which of the following examples of motion, can the body be considered approximately a point object?- a)a railway carriage moving without jerks between two stations
- b)a spinning top moving on a curved path
- c)a tumbling beaker that has slipped off the edge of a table
- d)a spinning cricket ball that turns sharply on hitting the ground
Correct answer is option 'A'. Can you explain this answer?
In which of the following examples of motion, can the body be considered approximately a point object?
a)
a railway carriage moving without jerks between two stations
b)
a spinning top moving on a curved path
c)
a tumbling beaker that has slipped off the edge of a table
d)
a spinning cricket ball that turns sharply on hitting the ground
|
|
Jyoti Kapoor answered |
(a) The size of a carriage is very small as compared to the distance between two stations. Therefore, the carriage can be treated as a point sized object.
(c) The size of a beaker is comparable to the height of the table from which it slipped. Hence, the beaker cannot be considered as a point object.
(d) The size of a spinning cricket ball is comparable to the distance through which it turns sharply on hitting the ground. Hence, the cricket ball cannot be considered as a point object.
In Kinematics we study- a)Ways to find jerk without going into the causes of motion.
- b)Ways to describe motion without going into the causes of motion.
- c)Ways to find velocity without going into the causes of motion.
- d)Ways to find acceleration without going into the causes of motion.
Correct answer is option 'B'. Can you explain this answer?
In Kinematics we study
a)
Ways to find jerk without going into the causes of motion.
b)
Ways to describe motion without going into the causes of motion.
c)
Ways to find velocity without going into the causes of motion.
d)
Ways to find acceleration without going into the causes of motion.
|
Kalyan Desai answered |
Explanation:Kinematics is a branch of classical mechanics that describes the motion of points, bodies (objects), and systems of bodies (groups of objects) without considering the mass of each or the forces that caused the motion.
For motion in a straight line- a)motion away from origin is positive
- b)motion towards origin is positive
- c)position to the left of the origin is taken as positive and to the right as negative.
- d)position to the right of the origin is taken as positive and to the left as negative.
Correct answer is option 'D'. Can you explain this answer?
For motion in a straight line
a)
motion away from origin is positive
b)
motion towards origin is positive
c)
position to the left of the origin is taken as positive and to the right as negative.
d)
position to the right of the origin is taken as positive and to the left as negative.
|
Raghav Chakraborty answered |
Explanation:To describe motion along a straight line, we can choose an axis, say X-axis, so that it coincides with the path of the object. We then measure the position of the object with reference to a conveniently chosen origin, say O, Positions to the right of O are taken as positive and to the left of O, as negative.
For motion in 3 dimensions we need- a)No frame of reference is required ; a set of 3 points will do.
- b)Frame of reference consisting of a clock and a Cartesian coordinate system having two mutually perpendicular axes, labeled X-, and Y- axes
- c)Frame of reference consisting of a clock and a Cartesian coordinate system having three mutually perpendicular axes, labeled X-, Y-, and Z- axes
- d)No frame of reference is required a single point will do.
Correct answer is option 'C'. Can you explain this answer?
For motion in 3 dimensions we need
a)
No frame of reference is required ; a set of 3 points will do.
b)
Frame of reference consisting of a clock and a Cartesian coordinate system having two mutually perpendicular axes, labeled X-, and Y- axes
c)
Frame of reference consisting of a clock and a Cartesian coordinate system having three mutually perpendicular axes, labeled X-, Y-, and Z- axes
d)
No frame of reference is required a single point will do.
|
Uday Chakraborty answered |
Explanation:Motion is a change in position of an object with time. In order to specify position, we need to use a reference point and a set of axes. It is convenient to choose a rectangular coordinate system consisting of three mutually perpenducular axes, labelled X-, Y-, and Z- axes.
The point of intersection of these three axes is called origin (O) and serves as the reference point. The coordinates (x, y. z) of an object describe the position of the object with respect to this coordinate system.
To measure time, we position a clock in this system. This coordinate system along with a clock constitutes a frame of reference.
Which out of the following is a ciliated protozoan?- a)Plasmodium vivax
- b)Amoeba proteus
- c)Paramoecium caudalum
- d)Leishmania donovani
Correct answer is option 'C'. Can you explain this answer?
Which out of the following is a ciliated protozoan?
a)
Plasmodium vivax
b)
Amoeba proteus
c)
Paramoecium caudalum
d)
Leishmania donovani
|
|
Mira Joshi answered |
Paramoecium is a free living ciliate which is found in fresh water. Most widely distributed species are Paramoecium caudatum and Paramoecium aurelia. The, cilia of the extreme posterior end are longer and form a bunch called caudal tuft.
Causal organisms of sleeping sickness and kala-azar belong to which of the following groups of protozoan protists?- a)Amoeboid protozoans
- b)Flagellated protozoans
- c)Ciliated protozoans
- d)Sporozoans
Correct answer is option 'B'. Can you explain this answer?
Causal organisms of sleeping sickness and kala-azar belong to which of the following groups of protozoan protists?
a)
Amoeboid protozoans
b)
Flagellated protozoans
c)
Ciliated protozoans
d)
Sporozoans
|
|
Jatin Shah answered |
Causal organisms of sleeping sickness and kala-azar belong to which of the following groups of protozoan protists?
The correct answer is option 'B' - Flagellated protozoans.
Explanation:
Protozoans are a diverse group of single-celled eukaryotic microorganisms that belong to the kingdom Protista. They can be classified into various groups based on their mode of locomotion and other characteristics.
Sleeping sickness and kala-azar are two diseases caused by different species of protozoans. Let's discuss each of them in detail:
1. Sleeping Sickness:
Sleeping sickness, also known as African trypanosomiasis, is caused by the Trypanosoma brucei parasite. This parasite is a flagellated protozoan that belongs to the class Kinetoplastida. Trypanosoma brucei is transmitted to humans through the bite of infected tsetse flies. Once inside the human body, the parasite multiplies in the bloodstream and the lymphatic system, causing a variety of symptoms including fever, fatigue, headaches, and eventually leading to sleep disturbances, neurological problems, and even death if left untreated.
2. Kala-azar:
Kala-azar, also known as visceral leishmaniasis, is caused by the Leishmania donovani parasite. This parasite is also a flagellated protozoan that belongs to the class Kinetoplastida. Leishmania donovani is transmitted to humans through the bite of infected sandflies. Once inside the human body, the parasite invades the cells of the immune system, particularly macrophages, and causes a range of symptoms including prolonged fever, weight loss, enlargement of the spleen and liver, and anemia.
Both Trypanosoma brucei and Leishmania donovani are flagellated protozoans, which means they possess one or more whip-like structures called flagella that enable them to move. These flagella help the parasites to swim through bodily fluids and invade host cells. Therefore, the causal organisms of sleeping sickness and kala-azar belong to the group of flagellated protozoans (option B).
The correct answer is option 'B' - Flagellated protozoans.
Explanation:
Protozoans are a diverse group of single-celled eukaryotic microorganisms that belong to the kingdom Protista. They can be classified into various groups based on their mode of locomotion and other characteristics.
Sleeping sickness and kala-azar are two diseases caused by different species of protozoans. Let's discuss each of them in detail:
1. Sleeping Sickness:
Sleeping sickness, also known as African trypanosomiasis, is caused by the Trypanosoma brucei parasite. This parasite is a flagellated protozoan that belongs to the class Kinetoplastida. Trypanosoma brucei is transmitted to humans through the bite of infected tsetse flies. Once inside the human body, the parasite multiplies in the bloodstream and the lymphatic system, causing a variety of symptoms including fever, fatigue, headaches, and eventually leading to sleep disturbances, neurological problems, and even death if left untreated.
2. Kala-azar:
Kala-azar, also known as visceral leishmaniasis, is caused by the Leishmania donovani parasite. This parasite is also a flagellated protozoan that belongs to the class Kinetoplastida. Leishmania donovani is transmitted to humans through the bite of infected sandflies. Once inside the human body, the parasite invades the cells of the immune system, particularly macrophages, and causes a range of symptoms including prolonged fever, weight loss, enlargement of the spleen and liver, and anemia.
Both Trypanosoma brucei and Leishmania donovani are flagellated protozoans, which means they possess one or more whip-like structures called flagella that enable them to move. These flagella help the parasites to swim through bodily fluids and invade host cells. Therefore, the causal organisms of sleeping sickness and kala-azar belong to the group of flagellated protozoans (option B).
A truck covers 40.0 m in 8.50 s while smoothly slowing down to a final speed of 2.80 m/s. Find its original speed in m/s
- a)6.61
- b)5.61
- c)7.61
- d)8.61
Correct answer is option 'A'. Can you explain this answer?
A truck covers 40.0 m in 8.50 s while smoothly slowing down to a final speed of 2.80 m/s. Find its original speed in m/s
a)
6.61
b)
5.61
c)
7.61
d)
8.61
|
Anjana Sharma answered |
v=v0+at
2.8=v0+8.5a--->1
x=v0t+1/2at^2
40=8.5v0+1/2a(8.5)^2 --2
Solve 1 and 2
v0 = 2.8-8.5a
40=8.5v0 +36.1a
40=8.5(2.8-8.5a) +36.1a
40=23.8-72.3a +36.1a
36.2a = -16.2
a = -0.448m/s^2
Substitute a value in v0 equation.
v0 = 2.8-8.5( -0.448m/s^2)
v0 = 6.61 m/sec
A truck is coming towards you from a distance of 1000m on a straight road, at time t=0. It reaches you in 100sec. The average speed in m/s is- a)14
- b)10
- c)17
- d)12
Correct answer is option 'B'. Can you explain this answer?
A truck is coming towards you from a distance of 1000m on a straight road, at time t=0. It reaches you in 100sec. The average speed in m/s is
a)
14
b)
10
c)
17
d)
12
|
|
Sinjini Shah answered |
Given information:
Distance of truck from observer = 1000 m
Time taken by truck to reach observer = 100 s
To find: Average speed of truck in m/s
Formula used:
Average speed = Total distance/Total time
Calculation:
Total distance covered by truck = 1000 m
Total time taken by truck to cover the distance = 100 s
Using the formula of average speed:
Average speed = Total distance/Total time
= 1000 m/100 s
= 10 m/s
Therefore, the average speed of the truck is 10 m/s.
Answer: Option (b) 10.
Distance of truck from observer = 1000 m
Time taken by truck to reach observer = 100 s
To find: Average speed of truck in m/s
Formula used:
Average speed = Total distance/Total time
Calculation:
Total distance covered by truck = 1000 m
Total time taken by truck to cover the distance = 100 s
Using the formula of average speed:
Average speed = Total distance/Total time
= 1000 m/100 s
= 10 m/s
Therefore, the average speed of the truck is 10 m/s.
Answer: Option (b) 10.
Name the instrument used to measure instantaneous speed of a vehicle.- a)multimeter
- b)accelerator
- c)speedometer
- d)ammeter
Correct answer is option 'C'. Can you explain this answer?
Name the instrument used to measure instantaneous speed of a vehicle.
a)
multimeter
b)
accelerator
c)
speedometer
d)
ammeter
|
Arshiya Datta answered |
Explanation:A speedometer or a speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles, they started to be available as options in the 1900s, and as standard equipment from about 1910 onwards.
Speedometers for other vehicles have specific names and use other means of sensing speed. For a boat, this is a pit log. For an aircraft, this is an airspeed indicator.
Charles Babbage is credited with creating an early type of a speedometer, which were usually fitted to locomotives.
With reference to the figure which shows a particle moving along a straight line , y axis represents the position and x axis represents time, if x1 = 18m, The average velocity at if x1 in m/s is
- a)180
- b)1.8
- c)18
- d)20
Correct answer is option 'C'. Can you explain this answer?
With reference to the figure which shows a particle moving along a straight line , y axis represents the position and x axis represents time, if x1 = 18m, The average velocity at if x1 in m/s is
a)
180
b)
1.8
c)
18
d)
20
|
Pooja Kulkarni answered |
Explanation:
Average velocity can be defined as the displacement divided by the time.
Total displacement d = 18 m
Time taken t = 1 s
Motion along a straight line is called __________.- a)oscillatory motion
- b)circular motion
- c)parabolic motion
- d)rectilinear motion
Correct answer is option 'D'. Can you explain this answer?
Motion along a straight line is called __________.
a)
oscillatory motion
b)
circular motion
c)
parabolic motion
d)
rectilinear motion
|
Ameya Mukherjee answered |
Explanation:Rectilinear motion is another name for straight-line motion. This type of motion describes the movement of a particle or a body. A body is said to experience rectilinear motion if any two particles of the body travel the same distance along two parallel straight lines.
The motion of a body is given by the equation 
where v(t) is speed in m/s and t in sec. If body was at rest at t = 0 , mark the correct options.- a)The terminal speed is 2.0 m/s
- b)The speed varies with the time as v (t) = 2 (1 − e− 3t) m/s
- c)The speed is 0.1 m/s when the acceleration is half the initial value
- d)The magnitude of the initial acceleration is 6.0 m /s2
Correct answer is option 'D'. Can you explain this answer?
The motion of a body is given by the equation where v(t) is speed in m/s and t in sec. If body was at rest at t = 0 , mark the correct options.
where v(t) is speed in m/s and t in sec. If body was at rest at t = 0 , mark the correct options.a)
The terminal speed is 2.0 m/s
b)
The speed varies with the time as v (t) = 2 (1 − e− 3t) m/s
c)
The speed is 0.1 m/s when the acceleration is half the initial value
d)
The magnitude of the initial acceleration is 6.0 m /s2
|
Lead Academy answered |
Substituting the value of K2 in equation (i)
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