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Mira RoyEduRev JEE |
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Mira Roy
EduRev JEE
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Top Scoring Tests by Mira
Test: Balancing Redox Reactions | 15/20 |
Test: Chemical Equilibrium: Le Chatelier's Principle | 56/76 |
Test: Van der Waals Equation (Old NCERT) | 59/84 |
MCQ (Previous Year Questions) - Straight Lines (Level 1) | 59/84 |
Sample JEE Main Full Mock Test | 250/360 |
JEE Main Practice Test- 27 | 250/360 |
Test: Properties of Colloids (Old NCERT) | 55/80 |
Test: Ideal Gas Equation & Dalton's Law of Partial Pressure (Old NCERT) | 44/64 |
Test: Thermodynamics: Basic Concepts | 55/80 |
JEE Advanced Level Test: Monotonicity- 2 | 44/64 |
Rated 5 
by Mira
by Mira | Induction Concept (Part - 1) - Principle of mathematical induction, Mathematics, Class 11 Video | 12:40 min |  |
 | Signs of Trigonometry Functions (Part - 6) - Trigonometry Functions, Mathematics, Class 11 Video | 05:44 min | |
 | Types of Linear Programming Problem (Part - 6) - Linear Programming, Maths, Class 12 Video | 12:44 min | |
 | Examples distance between two 2 points (Part - 3) - Introduction to 3d Geometry, Mathematics Video | 14:20 min | |
 | NCERT Textbook: Electrostatic Potential & Capacitance Doc | 36 pages | |
 | NCERT Solutions: Electrostatic Potential & Capacitance Doc | 31 pages | |
 | Example Discrete Frequency Distribution, Mean deviation about median- Statistics, Mathematics Video | 08:04 min | |
 | L14 : Section formula - Vector , Maths, Class 12 Video | 09:45 min | |
 | Properties of Definite Integrals (Part - 42) - Integrals, Maths, Class 12 Video | 08:59 min | |
 | Example Integration trigonometric Identities-1 (Part - 18) - Integrals, Maths, Class 12 Video | 14:56 min | |
 | NCERT Textbook: Wave Optics Doc | 19 pages | |
 | L20 : Vitamins - Biomolecules, Chemistry, Class 12 Video | 06:11 min | |
 | Preparation: Ammonolysis of Alkyl Halides (Part -10) - Organic Compounds containing Nitrogen Video | 08:05 min | |
 | Derivative Parametric Function (Part - 32)- Continuity & Differentiability, Maths, Class 12 Video | 06:20 min | |
 | IUPAC names & common names (Part - 23) - Aldehydes, Ketones and Carboxylic Acids, Chemistry Video | 19:25 min | |
 | NCERT Solutions: Nuclei Doc | 22 pages | |
 | Reactivity of aldehydes & keton - Aldehydes, Ketones and Carboxylic Acids, Chemistry, Class 12 Video | 14:33 min | |
 | L15 : Alcohol test - Alcohol, Phenol & Ether, Chemistry, Class 12 Video | 05:47 min | |
 | L24 : Random variables : Examples-2 - Probability, Maths, Class 12 Video | 13:16 min | |
 | NCERT Textbook: Electromagnetic Waves Doc | 14 pages | |
 | NCERT Textbook: Electromagnetic Induction Doc | 23 pages | |
 | Example :Plane Normal Form-2 (Part - 18) - Three Dimensional Geometry, Maths, Class 12 Video | 07:48 min | |
 | Adsorption: Chemisorption & Physisorption (Part - 6) - Surface Chemistry, Chemistry, Class 12 Video | 18:03 min | |
 | L7 : Equivalence Relations - Relations and Functions, Maths, Class 12 Video | 07:36 min | |
 | L23: Raoult's law: Numerical -2- Solutions, Chemistry, Class 12 Video | 10:39 min | |
 | L34 : Numerical -2 - Solutions, Chemistry, Class 12 Video | 16:22 min | |
 | Introduction to Integrals Doc | 4 pages | |
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 | NCERT Solutions: Atoms Doc | 6 pages | |
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 | NCERT Solutions: Moving Charges & Magnetism Doc | 24 pages | |
 | NCERT Solutions Exercise 3.1: Matrices Doc | 5 pages | |
 | Solved Examples: Electrochemistry Doc | 23 pages | |
Discussed Questions
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Mira Roy upvoted • 6 days ago |
Can you explain the answer of this question below:Two blocks of the masses 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 m/s to the heavier block. The velocity of centre of mass is
- A:
10 m/s
- B:
5 m/s
- C:
15 m/s
- D:
20 m/s
The answer is a.
Two blocks of the masses 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 m/s to the heavier block. The velocity of centre of mass is
10 m/s
5 m/s
15 m/s
20 m/s
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EduRev JEE answered |
Velocity of heavier block (v2) = 14m/s
Velocity of lighter block (v1) = 0m/s
Velocity of centre of mass,
Velocity of lighter block (v1) = 0m/s
Velocity of centre of mass,
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Mira Roy upvoted • Feb 09, 2025 |
For fanning friction factor f (for flow in pipes) and drag coefficient CD(for flow over immersed
bodies), which of the following statements are true?
P: f accounts only for the skin friction
Q: CD accounts only for the form friction
R: CD accounts for both skin friction and form friction
S: Both f and CD depend on the Reynolds number
T: For laminar flow through a pipe, f doubles on doubling the volumetric flow rate.- a)R,S,T
- b)P,Q,S
- c)P,R,S
- d)P,Q,S,T
Correct answer is option 'C'. Can you explain this answer?
For fanning friction factor f (for flow in pipes) and drag coefficient CD(for flow over immersed
bodies), which of the following statements are true?
P: f accounts only for the skin friction
Q: CD accounts only for the form friction
R: CD accounts for both skin friction and form friction
S: Both f and CD depend on the Reynolds number
T: For laminar flow through a pipe, f doubles on doubling the volumetric flow rate.
bodies), which of the following statements are true?
P: f accounts only for the skin friction
Q: CD accounts only for the form friction
R: CD accounts for both skin friction and form friction
S: Both f and CD depend on the Reynolds number
T: For laminar flow through a pipe, f doubles on doubling the volumetric flow rate.
a)
R,S,T
b)
P,Q,S
c)
P,R,S
d)
P,Q,S,T
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Mohit Rajpoot answered |
Correct Statements are
P : f accounts only for the skin friction
R : CD accounts for both skin friction and form friction
S : Both f and CD depends on the Reynolds number
P : f accounts only for the skin friction
R : CD accounts for both skin friction and form friction
S : Both f and CD depends on the Reynolds number
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Mira Roy upvoted • Jan 24, 2025 |
Two plane mirrors of length L are separated by distance L and a man M2 is standing at distance L from the connecting line of mirrors as shown in figure. A man M1 is walking in a straight line at distance 2L parallel to mirrors at speed u, then man M2 at O will be able to see image of M1 for total time : 
... more
Two plane mirrors of length L are separated by distance L and a man M2 is standing at distance L from the connecting line of mirrors as shown in figure. A man M1 is walking in a straight line at distance 2L parallel to mirrors at speed u, then man M2 at O will be able to see image of M1 for total time :
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Praveen Kumar answered |
The light from man M1 hits the mirror and then reaches the man M2. The positions of the moving man need to be found when the light from him hits the corners of the mirror to reach the standing man.
From geometry,
AO′=L/2+2(L/2)
=3L/2
Similarly, BO′=(3L/2)+2(3L/2)
=9L/2
Hence AB=(9L/2)-(3L/2)=3/2
Time taken to cover this distance=3L/u
Similarly time taken to cover CD=3L/u
Thus total time he is visible is 6L/u
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Mira Roy upvoted • Oct 31, 2024 |
Benzoic acid dissolved in benzene will show a molecular weight of- a)366g
- b)122g
- c)61g
- d)244g
Correct answer is option 'D'. Can you explain this answer?
Benzoic acid dissolved in benzene will show a molecular weight of
a)
366g
b)
122g
c)
61g
d)
244g
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Dr Manju Sen answered |
In benzene, benzoic acid exist as dimer. So the molecular weight of benzoic acid gets doubled.
(C6H5COOH)2=2×122=244 units .
Read the assertion and reason carefully to mark the correct option out of the options given below:Assertion : The bridges declared unsafe after a long use.Reason : Elastic strength of bridges losses with time.- a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
- b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
- c)If assertion is true but reason is false.
- d)If the assertion and reason both are false.
Correct answer is option 'A'. Can you explain this answer?
Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion : The bridges declared unsafe after a long use.
Reason : Elastic strength of bridges losses with time.
a)
If both assertion and reason are true and the reason is the correct explanation of the assertion.
b)
If both assertion and reason are true but reason is not the correct explanation of the assertion.
c)
If assertion is true but reason is false.
d)
If the assertion and reason both are false.
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Mira Roy answered • Oct 25, 2024 |
Understanding the Assertion and Reason
The assertion states that bridges are often declared unsafe after prolonged use. This is a common scenario in civil engineering where structures undergo wear and tear over time.
Key Points of the Assertion:
- Long-term Use: Bridges are subjected to constant loads and environmental factors.
- Safety Concerns: Reg... more
The assertion states that bridges are often declared unsafe after prolonged use. This is a common scenario in civil engineering where structures undergo wear and tear over time.
Key Points of the Assertion:
- Long-term Use: Bridges are subjected to constant loads and environmental factors.
- Safety Concerns: Reg... more
Read the assertion and reason carefully to mark the correct option out of the options given below:Assertion : Identical springs of steel and copper are equally stretched. More work will be done on the steel spring.Reason : Steel is more elastic than copper.- a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
- b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
- c)If assertion is true but reason is false.
- d)If the assertion and reason both are false.
Correct answer is option 'A'. Can you explain this answer?
Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion : Identical springs of steel and copper are equally stretched. More work will be done on the steel spring.
Reason : Steel is more elastic than copper.
a)
If both assertion and reason are true and the reason is the correct explanation of the assertion.
b)
If both assertion and reason are true but reason is not the correct explanation of the assertion.
c)
If assertion is true but reason is false.
d)
If the assertion and reason both are false.
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Mira Roy answered • Oct 25, 2024 |
Understanding the Assertion and Reason
The assertion and reason presented in the question revolve around the properties of materials, specifically steel and copper, when they are subjected to the same stretching force.
Assertion Explained
- Identical springs made of steel and copper, when equally stretched, indicate that they are experiencing the same amount of deforma... more
The assertion and reason presented in the question revolve around the properties of materials, specifically steel and copper, when they are subjected to the same stretching force.
Assertion Explained
- Identical springs made of steel and copper, when equally stretched, indicate that they are experiencing the same amount of deforma... more
Read the assertion and reason carefully to mark the correct option out of the options given below:Assertion : Two identical solid balls, one of ivory and the other of wet-clay are dropped from the same height on the floor. Both the balls will rise to same height after bouncing.Reason : Ivory and wet-clay have same elasticity.- a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
- b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
- c)If assertion is true but reason is false.
- d)If the assertion and reason both are false.
Correct answer is option 'D'. Can you explain this answer?
Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion : Two identical solid balls, one of ivory and the other of wet-clay are dropped from the same height on the floor. Both the balls will rise to same height after bouncing.
Reason : Ivory and wet-clay have same elasticity.
a)
If both assertion and reason are true and the reason is the correct explanation of the assertion.
b)
If both assertion and reason are true but reason is not the correct explanation of the assertion.
c)
If assertion is true but reason is false.
d)
If the assertion and reason both are false.
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Mira Roy answered • Oct 25, 2024 |
Understanding the Assertion and Reason
The assertion presented states that two identical solid balls, one made of ivory and the other of wet clay, when dropped from the same height, will bounce back to the same height. The reason given is that both materials have the same elasticity.
Evaluation of the Assertion
- Material Properties: Ivory is a hard and elastic ... more
The assertion presented states that two identical solid balls, one made of ivory and the other of wet clay, when dropped from the same height, will bounce back to the same height. The reason given is that both materials have the same elasticity.
Evaluation of the Assertion
- Material Properties: Ivory is a hard and elastic ... more
?
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Mira Roy answered • Oct 25, 2024 |
The Grandmother's Decision
The grandmother in the story "The Portrait of a Lady" by Khushwant Singh reflects a deep bond with her surroundings and the life she has lived. Her decision to spend her days in the city is shaped by various factors:
1. Change in Environment
- The grandmother initially leads a life in the village, surrounded by nature and simplicity.
- H... more
The grandmother in the story "The Portrait of a Lady" by Khushwant Singh reflects a deep bond with her surroundings and the life she has lived. Her decision to spend her days in the city is shaped by various factors:
1. Change in Environment
- The grandmother initially leads a life in the village, surrounded by nature and simplicity.
- H... more
which book should I prefer for physics 12th?
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Mira Roy answered • Oct 25, 2024 |
Choosing the Right Physics Book for 12th Grade
Selecting the right book for 12th-grade physics is crucial for mastering concepts and excelling in exams. Here are some recommended options:
1. NCERT Physics for Class 12
- This is the official textbook prescribed by CBSE.
- It provides a strong foundation in basic concepts.
- Includes a variety of solved and uns... more
Selecting the right book for 12th-grade physics is crucial for mastering concepts and excelling in exams. Here are some recommended options:
1. NCERT Physics for Class 12
- This is the official textbook prescribed by CBSE.
- It provides a strong foundation in basic concepts.
- Includes a variety of solved and uns... more
how was the tiger king at risk of loosing his kingdom?
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Mira Roy answered • Oct 25, 2024 |
Threats to the Tiger King's Kingdom
The "Tiger King," Joe Exotic, faced numerous risks that jeopardized his empire of big cats and exotic animal ownership. Several factors contributed to this threat.
Legal Issues
- Animal Welfare Violations: Joe Exotic was frequently under scrutiny for his treatment of the animals. Numerous complaints were filed against him, lea... more
The "Tiger King," Joe Exotic, faced numerous risks that jeopardized his empire of big cats and exotic animal ownership. Several factors contributed to this threat.
Legal Issues
- Animal Welfare Violations: Joe Exotic was frequently under scrutiny for his treatment of the animals. Numerous complaints were filed against him, lea... more
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Mira Roy upvoted • Oct 08, 2024 |
Explain the conflict found in British colonial practice and western theories of democracy.?
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Amar Pillai answered |
Here is the link:
lanthanoid contraction is caused due to - [AIEEE-2006]- a)The same effective nuclear charge from Ce to Lu
- b)The imperfect shielding on outer electrons by 4f electrons from the nuclear charge
- c)The appreciable shielding on outer electrons by 4f electrons from the nuclear charge
- d)The appreciable shielding on outer electrons by 5d electrons from the nuclear charge
Correct answer is option 'B'. Can you explain this answer?
lanthanoid contraction is caused due to - [AIEEE-2006]
a)
The same effective nuclear charge from Ce to Lu
b)
The imperfect shielding on outer electrons by 4f electrons from the nuclear charge
c)
The appreciable shielding on outer electrons by 4f electrons from the nuclear charge
d)
The appreciable shielding on outer electrons by 5d electrons from the nuclear charge
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Mira Roy answered • Sep 20, 2024 |
Understanding Lanthanoid Contraction
Lanthanoid contraction refers to the gradual decrease in the ionic radii of the lanthanide series elements from lanthanum (La) to lutetium (Lu). This phenomenon is primarily due to the behavior of the 4f electrons.
Key Factors Contributing to Lanthanoid Contraction
- Effective Nuclear Charge
- As we move from La to Lu, ... more
Lanthanoid contraction refers to the gradual decrease in the ionic radii of the lanthanide series elements from lanthanum (La) to lutetium (Lu). This phenomenon is primarily due to the behavior of the 4f electrons.
Key Factors Contributing to Lanthanoid Contraction
- Effective Nuclear Charge
- As we move from La to Lu, ... more
Which of the following is another term for magnetization?- a)Magnetic neutrality
- b)Magnetic polarization
- c)Magnetic power
- d)Magnetic moment
Correct answer is option 'B'. Can you explain this answer?
Which of the following is another term for magnetization?
a)
Magnetic neutrality
b)
Magnetic polarization
c)
Magnetic power
d)
Magnetic moment
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Mira Roy answered • Apr 16, 2024 |
Explanation:
Magnetic Polarization:
Magnetic polarization is another term for magnetization. It refers to the process by which the magnetic dipoles within a material align in response to an external magnetic field. This alignment results in the material becoming magnetized.
Importance of Magnetic Polarization:
- Magnetic polarization plays a cru... more
Magnetic Polarization:
Magnetic polarization is another term for magnetization. It refers to the process by which the magnetic dipoles within a material align in response to an external magnetic field. This alignment results in the material becoming magnetized.
Importance of Magnetic Polarization:
- Magnetic polarization plays a cru... more
Read the passage given below and answer the following questions:Within the 3d series, manganese exhibits oxidation states in aqueous solution from +2 to +7, ranging from Mn2+(aq) to MnO−4 (aq). Likewise, iron forms both Fe2+(aq) and Fe3+(aq) as well as the FeO2−4 ion. Cr and Mn form oxyions CrO2−4, MnO−4, owing to their willingness to form multiple bonds. The pattern with the early transition metals—in the 3d series up to Mn, and for the 4d, 5d metals up to Ru and Os—is that the maximum oxidation state corresponds to the number of ‘‘outer shell’’ electrons. The highest oxidation states of the 3d metals may depend upon complex formation (e.g., the stabilization of Co3+ by ammonia) or upon the pH (thus MnO42− (aq) is prone to disproportionation in acidic solution). Within the 3d series, there is considerable variation in relative stability of oxidation states, sometimes on moving from one metal to a neighbour; thus, for iron, Fe3+ is more stable than Fe2+, especially in alkaline conditions, while the reverse is true for cobalt. The ability of transition metals to exhibit a wide range of oxidation states is marked with metals such as vanadium, where the standard potentials can be rather small, making a switch between states relatively easy.In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion (A): Highest oxidation state is exhibited by transition metal lying in the middle of the series.Reason (R): The highest oxidation state exhibited corresponds to number of (n−1)d electrons.... more
Read the passage given below and answer the following questions:
Within the 3d series, manganese exhibits oxidation states in aqueous solution from +2 to +7, ranging from Mn2+(aq) to MnO−4 (aq). Likewise, iron forms both Fe2+(aq) and Fe3+(aq) as well as the FeO2−4 ion. Cr and Mn form oxyions CrO2−4, MnO−4, owing to their willingness to form multiple bonds. The pattern with the early transition metals—in the 3d series up to Mn, and for the 4d, 5d metals up to Ru and Os—is that the maximum oxidation state corresponds to the number of ‘‘outer shell’’ electrons. The highest oxidation states of the 3d metals may depend upon complex formation (e.g., the stabilization of Co3+ by ammonia) or upon the pH (thus MnO42− (aq) is prone to disproportionation in acidic solution). Within the 3d series, there is considerable variation in relative stability of oxidation states, sometimes on moving from one metal to a neighbour; thus, for iron, Fe3+ is more stable than Fe2+, especially in alkaline conditions, while the reverse is true for cobalt. The ability of transition metals to exhibit a wide range of oxidation states is marked with metals such as vanadium, where the standard potentials can be rather small, making a switch between states relatively easy.
In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.
Assertion (A): Highest oxidation state is exhibited by transition metal lying in the middle of the series.
Reason (R): The highest oxidation state exhibited corresponds to number of (n−1)d electrons.
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Mira Roy answered • Apr 16, 2024 |
Explanation:
Assertion and Reason Analysis
Assertion (A): Highest oxidation state is exhibited by transition metal lying in the middle of the series.
Reason (R): The highest oxidation state exhibited corresponds to the number of (n−1)d electrons.
Explanation:
Assertion Clarification:
- In the 3d s... more
Assertion and Reason Analysis
Assertion (A): Highest oxidation state is exhibited by transition metal lying in the middle of the series.
Reason (R): The highest oxidation state exhibited corresponds to the number of (n−1)d electrons.
Explanation:
Assertion Clarification:
- In the 3d s... more
The electric field at a point due to an electric dipole, on an axis inclined at an angle (theta<90 deg)="" to="" the="" dipole="" axis,="" is="" perpendicular="" to="" the="" dipole="" axis,="" if="" the="" angle="" theta="" ... more
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Mira Roy answered • Apr 16, 2024 |
The Electric Field due to an Electric Dipole at an Inclined Axis
Electric dipoles consist of two opposite charges of equal magnitude separated by a distance. When an electric dipole is placed on an axis inclined at an angle θ, the electric field at a point on that axis can be calculated using the formula for the electric field due to a dipole.
Electric Field Calculation... more
Electric dipoles consist of two opposite charges of equal magnitude separated by a distance. When an electric dipole is placed on an axis inclined at an angle θ, the electric field at a point on that axis can be calculated using the formula for the electric field due to a dipole.
Electric Field Calculation... more
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Mira Roy asked • Feb 03, 2020 |
There are three bags B1, B2 and B3. The bag B1 contains 5 red and 5 green balls, B2 contains 3 red and 5 green balls, and B3 contains 5 red and 3 green balls, Bags B1, B2 and B3 have probabilities 
respectively of being chosen. A bag is selected at random and a ball is chosen at random from the bag. Then which of the following options is/are correct?- a)Probability that the selected bag is B3 and the chosen ball is green equals 3/10
- b)Probability that the chosen ball is green equals 39/80
- c)Probability that the chosen ball is green, given that the selected bag is B3, equals 3/8
- d)Probability that the selected bag is B3, given that the chosen balls are green, equals 5/13
Correct answer is option 'B,C'. Can you explain this answer?
There are three bags B1, B2 and B3. The bag B1 contains 5 red and 5 green balls, B2 contains 3 red and 5 green balls, and B3 contains 5 red and 3 green balls, Bags B1, B2 and B3 have probabilities respectively of being chosen. A bag is selected at random and a ball is chosen at random from the bag. Then which of the following options is/are correct?
respectively of being chosen. A bag is selected at random and a ball is chosen at random from the bag. Then which of the following options is/are correct?a)
Probability that the selected bag is B3 and the chosen ball is green equals 3/10
b)
Probability that the chosen ball is green equals 39/80
c)
Probability that the chosen ball is green, given that the selected bag is B3, equals 3/8
d)
Probability that the selected bag is B3, given that the chosen balls are green, equals 5/13
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Janani Roy answered |
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Mira Roy asked • Jan 31, 2020 |
Three point masses 1kg, 1.5 kg, 2.5 kg are placed at the vertices of a triangle with sides 3cm, 4cm and 5cm as shown in the figure. The location of centre of mass with respect to 1kg mass is :
- a)0.6 cm to the right of 1 kg and 2 cm above 1 kg mass
- b)0.9 cm to the right of 1kg and 2 cm above 1 kg mass
- c)0.9 cm to the left of 1kg and 2 cm above 1kg mass
- d)0.9 cm to the right of 1 kg and 1.5 cm above 1kg mass
Correct answer is option 'B'. Can you explain this answer?
Three point masses 1kg, 1.5 kg, 2.5 kg are placed at the vertices of a triangle with sides 3cm, 4cm and 5cm as shown in the figure. The location of centre of mass with respect to 1kg mass is :
a)
0.6 cm to the right of 1 kg and 2 cm above 1 kg mass
b)
0.9 cm to the right of 1kg and 2 cm above 1 kg mass
c)
0.9 cm to the left of 1kg and 2 cm above 1kg mass
d)
0.9 cm to the right of 1 kg and 1.5 cm above 1kg mass
|
Rohit Jain answered |
Take 1kg mass at origin
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Mira Roy asked • Jan 27, 2020 |
A data consists of n observations:
x1, x2, ....., xn. If 
and 
, then the standard deviation of this data is :- a)5
- b)√5
- c)√7
- d)2
Correct answer is option 'B'. Can you explain this answer?
A data consists of n observations:
x1, x2, ....., xn. If and , then the standard deviation of this data is :
x1, x2, ....., xn. If
and , then the standard deviation of this data is :a)
5
b)
√5
c)
√7
d)
2
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Rohit Jain answered |
⇒ variance = 6 – 1 = 5
⇒ Standard diviation = √5
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Mira Roy asked • Jan 24, 2020 |
Let O be the vertex and Q be any point on the parabola, x2 = 8y. If the point P divides the line segment OQ internally in the ratio 1 : 3, then the locus of P is- a)x2 = y
- b)y2 = x
- c)y2 = 2x
- d)x2 = 2y
Correct answer is option 'D'. Can you explain this answer?
Let O be the vertex and Q be any point on the parabola, x2 = 8y. If the point P divides the line segment OQ internally in the ratio 1 : 3, then the locus of P is
a)
x2 = y
b)
y2 = x
c)
y2 = 2x
d)
x2 = 2y
|
Palak Gupta answered |
x2 = 8y
Let Q be (4t, 2t2)
Let P be (h, k)
∴ h = t,
∴ 2 k =h2
∴ Locus of (h, k) is x2 = 2y.
Let Q be (4t, 2t2)
Let P be (h, k)
∴ h = t,
∴ 2 k =h2
∴ Locus of (h, k) is x2 = 2y.
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Mira Roy asked • Jan 20, 2020 |
The energy associated with electric field is (UE) and with magnetic field is (UB) for an electromagnetic wave in free space. Then :- a)
- b)UE < UB
- c)UE = UB
- d)UE > UB
Correct answer is option 'C'. Can you explain this answer?
The energy associated with electric field is (UE) and with magnetic field is (UB) for an electromagnetic wave in free space. Then :
a)
b)
UE < UB
c)
UE = UB
d)
UE > UB
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Puja Patel answered |
Average energy density of magnetic field,
is maximum value of magnetic field.
Average energy density of electric field,
now,
uE = uB
since energy density of electric & magnetic field is same, energy associated with equal volume will be equal.
uE = uB
is maximum value of magnetic field.
Average energy density of electric field,
now,
uE = uB
since energy density of electric & magnetic field is same, energy associated with equal volume will be equal.
uE = uB
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Mira Roy asked • Jan 16, 2020 |
Consider the given plots for a reaction obeying Arrhenius equation (0°C < T < 300°C) : (k and Ea are rate constant and activation energy, respectively)
- a)Both I and II are wrong
- b)I is wrong but II is right
- c)Both I and II are correct
- d)I is right but II is wrong
Correct answer is option 'C'. Can you explain this answer?
Consider the given plots for a reaction obeying Arrhenius equation (0°C < T < 300°C) : (k and Ea are rate constant and activation energy, respectively)
a)
Both I and II are wrong
b)
I is wrong but II is right
c)
Both I and II are correct
d)
I is right but II is wrong
|
Lavanya Menon answered |
On increasing Ea, K dec reases
|
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Mira Roy asked • Jan 09, 2020 |
It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is pd; while for its similar collision with carbon nucleus at rest, fractional loss of energy is pc. The values of pd and pc are respectively :- a)(.89, .28)
- b)(.28, .89)
- c)(0, 0)
- d)(0, 1)
Correct answer is option 'A'. Can you explain this answer?
It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is pd; while for its similar collision with carbon nucleus at rest, fractional loss of energy is pc. The values of pd and pc are respectively :
a)
(.89, .28)
b)
(.28, .89)
c)
(0, 0)
d)
(0, 1)
|
Debolina Kulkarni answered |
Given information:
- Neutron suffers an elastic collinear collision with deuterium at rest.
- Neutron suffers an elastic collinear collision with carbon nucleus at rest.
To find:
The fractional loss of energy in each collision, i.e., pd and pc.
Solution:
Elastic collision:
An elastic collision is a collision in which both m... more
- Neutron suffers an elastic collinear collision with deuterium at rest.
- Neutron suffers an elastic collinear collision with carbon nucleus at rest.
To find:
The fractional loss of energy in each collision, i.e., pd and pc.
Solution:
Elastic collision:
An elastic collision is a collision in which both m... more
|
|
Mira Roy asked • Jan 06, 2020 |
Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance? - a)
- b)
- c)
- d)
Correct answer is option 'D'. Can you explain this answer?
Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance?
a)
b)
c)
d)
|
Reena Dhanesh Kumar answered |
In materials that exhibit antiferromagnetism, the magnetic moments of atoms or molecules, usually related to the spins of electrons, align in a regular pattern with neighboring spins (on different sublattices) pointing in opposite directions.
|
|
Mira Roy asked • Jan 02, 2020 |
Two forces P and Q of magnitude 2F and 3F, respectively, are at an angle θ with each other. If the force Q is doubled, then their resultant also gets doubled. Then, the angle is :- a)30º
- b)60º
- c)90º
- d)120º
Correct answer is option 'D'. Can you explain this answer?
Two forces P and Q of magnitude 2F and 3F, respectively, are at an angle θ with each other. If the force Q is doubled, then their resultant also gets doubled. Then, the angle is :
a)
30º
b)
60º
c)
90º
d)
120º
|
|
Arnav Datta answered |
4F2 + 9F2 + 12F2 cos θ = R2
4F2 + 36 F2 + 24 F2 cos θ = 4R2
4F2 + 36 F2 + 24 F2 cos θ
= 4(13F2 + 12F2cosθ) = 52 F2 + 48F2cosθ
4F2 + 36 F2 + 24 F2 cos θ = 4R2
4F2 + 36 F2 + 24 F2 cos θ
= 4(13F2 + 12F2cosθ) = 52 F2 + 48F2cosθ
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