Bihar PGT Physics Mock Test - 7 - Bihar PGT/TGT/PRT MCQ

Daze means a situation that is slow and causes a sort of numb. Thus, trance is the correct synonym for daze. 
Example- After the accident, Mohan went into a state of trance.

The word 'between' is used when two things or persons are being compared or depicted.
Example-I had to select between the two destinations for the vacation.
Thus, the statement should read as 'Kajal was sitting between Prachi and Isha at the party that night.'

'कविवचन सुधा' पत्रिका के संपादक "भारतेन्दु हरिश्चंद्र' थे। काशी से प्रकाशित 'कविवचन सुधा' पत्रिका का आरंभ 1868 में हुआ था। इसके प्रकाशक भारतेन्दु हरिश्चंद्र थे।

रचनाकाल के आधार पर निम्नलिखित रचनाओं का सही अनुक्रम है: चंदायन (1379 ई.), मृगावती ( 1501 ई. ), मधुमालती ( 1545 ई. ), चित्रावली ( 1613 ई.) चंदायन, मृगावती, मधुमालती और चित्रावली हिंदी के प्रमुख सूफ़ी काव्य हैं। भारत में सूफ़ी धर्म का प्रचार - प्रसार 12 वीं शताब्दी में चिश्ती ने किया था।

• ​Is a substance that contains living microorganisms.
• These, when applied to seeds, plant surfaces, or soil, colonize the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant. 
• Biofertilizers add nutrients through the natural processes of Nitrogen fixation.
• Examples: Rhizobium, Azotobacter, Blue-green algae, Azospirilium.

Key PointsBlue green algae:

• Blue-green algae (BGA) is a photoautotrophic, prokaryotic algae.
• They are free-living creatures and also known as Cyanobacteria.
• It fixes the atmospheric nitrogen in moist soils.
• So BGA has been recommended as a biofertilizer.
• The algae include unicellular as well as filamentous species.
• Some of the filamentous forms have specialized cells known as heterocysts.​

Important Points

Biofertilizers:

Thus, the manure also considered as bio-fertilizer is Blue green algae.

Additional Information

Compost: 

• Composting is a process in which both aerobic and anaerobic micro-organisms decompose organic matter.
• Farm compost is a mass of rotted organic matter made from farm waste like sugarcane trash, paddy straw, weeds and other plants.
• While town compost is a mass of rotted organic matter made from town refuses like night soil, street sweepings and dustbin refuse.

​Green Manure:

• Green manures are the crops that are grown primarily for building and maintaining soil fertility and structure.
• Green manure crops should be such that they can be grown quickly.
• Green manure crops include legumes such as vetch, clover, beans and peas; grasses such as annual ryegrass, oats, rapeseed, winter wheat and winter rye and buckwheat.
• Green manure crops provide nitrogen as the major nutrient.

Farmyard Manure:

• It is the decomposed mixture of dung and urine of farm animals.
• It also contains litter and leftover materials from roughages or fodder fed to cattle.

The Correct Answer is Two.

 Key Points

• The water molecule is composed of two hydrogen atoms, each linked by a single chemical bond to an oxygen atom.
• Most hydrogen atoms have a nucleus consisting solely of a proton. 
• Water is a tasteless and odorless liquid at room temperature.
• It has the important ability to dissolve much other substance.

 Additional Information

• Two isotopic forms, deuterium and tritium, in which the atomic nuclei also contain one and two neutrons, respectively, are found to a small degree in water.
• Deuterium oxide (D2O) is called heavy water
• It is used as a neutron moderator in some nuclear reactors.

Hence, the person does not satisfy all the conditions.

The logic followed is:

In each next step 1 line segment is deleting from the given letter.

In figure A

The given shape is the letter "E".

In figure B

One line segment get deleted from the right end

Thus we get 

In figure C

Again the one-line segment gets deleted from the right end.

Thus we get 

Similarly,

In figure D

Again one line segment will get deleted from the previous image to obtained figure D.

Thus only one figure is satisfying the pattern.

Hence, the correct answer is "Option 2".

Mawsynram, Meghalaya:

• Mawsynram place in India has the highest average rainfall recorded.
• Mawsynram has a subtropical highland climate.
• Mawsynram receives nearly 10,000 millimetres of rain in an average year.
• Mawsynram is located in the East Khasi Hills district of Meghalaya.
• It is on the windward side of the hills and is surrounded by hills on three sides.
• It receives rain from southwest monsoon winds (Bay of Bengal branch), as the winds cannot move further striking the hills and due to condensation receives heavy rainfall.

Thus, Mawsynram in India has the highest rainfall.

Important Point

• The average rainfall in Bengaluru is 776.6 mm
• The average rainfall in Mysore is 500 mm.
• The average rainfall in Srinagar is 720 mm.

Additional Information

The Venn diagram that best represents the relationship between Crockery, Plate, and Bowl is shown below:

Bowl and Plate are name of Crockery items.

Hence, ‘option 3’ is the correct answer.

The correct answer is Potato.

Modifications of Root

1. For storage of food
   • Roots are modified in some plants for storing reserve food materials.
   • These modified roots usually are swollen and assume different forms such as spindle-shaped, e.g., radish; top-shaped, e.g., beet, turnip; cone-like, e.g., carrot; indefinite shape, e.g., sweet potatoes.
   • Dahlia, Asparagus, Portulaca are some other examples of plants with modified roots for food storage.
2. Nodulated roots
   • The roots of pea and other leguminous plants have numerous swollen nodules on fine branches of roots.
   • These nodules are formed due to the symbiotic association of Rhizobium (bacterium) that live inside the root cortical cells of the roots.
   • They fix nitrogen and an active nodule is pink in colour.
3. For mechanical support
   • Roots are modified to provide mechanical support as seen in a banyan tree which has roots growing vertically/obliquely downwards (prop roots); sugarcane/maize in which roots arise from the nodes in the cluster at the base of the stem (stilt roots) and betel/black pepper in which nodes and internodes bear roots which help in climbing.
4. For gaseous exchange
   • Pneumatophores or breathing roots are found in plants growing in mangroves or swamps with saline water for exchange of gases.
   • They are erect peg-like structures with numerous pores through which air circulates e.g., Rhizophora mangle.

• Modifications of Stem

1. For storage of food
   • Stems get modified into underground structures for storage of food as seen in potato (tuber), ginger (rhizome), garlic (bulb), yam (corm).
   • Presence of an eye (node) in potato, distinct nodes with internodes and scaly leaves in ginger/yam, a cluster of roots at the base of the reduced stem in garlic/ onion, all indicate that these underground plant parts are modified stem.
2. For vegetative propagation
   • Plants besides reproducing sexually also propagate through vegetative parts.
   • For this purpose, stems may be modified into a runner (Cyanodon dactylon, Oxalis). Runners are slender prostrate branches arising from axillary buds;
   • stolon (e.g., mint, strawberry) which is a slender lateral branch arising from the base of the stem grows upward and then down to develop new daughter plants;
   • offset having a single long horizontal internode growing up to some distance and producing a tuft of leaves above and a cluster of roots below at the apex (Eichornia, Pistia) and
   • sucker, which arises from the underground part of the stem, grow obliquely and gives rise to a new shoot. (Chrysanthemum, Banana, Pineapple).
3. For protection
   • Some modified stem provides protection as thorns which are hard, pointed structures each representing a branch that arises from the axil of a leaf.
   • Thorns are found in plants like Duranta, Pomegranate, Acacia, Ber, Prosopis, Bougainvillea, Citrus, etc.
4. For support
   • Tendrils are modifications of the stem to provide support to plants, e.g., Vitis, passionflower, Bignonia etc.
5. For photosynthesis
   • Stems are also modified into Phylloclade, to facilitate photosynthesis.
   • Phylloclades are flattened/cylindrical stem or branches of unlimited growth (Cactus).

Concept:

• Food chain:​ The sequence of living organisms in a community in which one organism consumes another organism to transfer food energy is called a food chain.
• In simple words, A list of organisms showing 'who eats whom' is called the food chain.
• The food can be transferred from one organism to the other through the food chain.
• Each step in the food chain is represented by a trophic level.
• Producers occupy the base of the food chain, producers are followed by Consumers → Secondary consumers → Tertiary consumers → Decomposers.

Explanation:

• Humans occupy the position of consumers in a food chain.
• The human can be divided into two types of consumers - Primary consumer & Secondary consumer.
• Primary Consumer - When humans derive their nutrition directly from the producers (green plants) in the form of fruits & vegetables.
• Secondary Consumer - When humans derive the nutrition indirectly by eating primary consumers like goat, cow & buffalo.

Given, the maximum kinetic energy: K_max​=4eV
If V₀​ be the stopping potential, then K_max​=eV_0​
⇒eV_0​=4eV 
⇒V₀​=4V

Net force = 50 - 20 = 30 N
Limiting friction on the body = u (static) × m × g = 0.6 × 10 × 10 = 60 N.
F = 30 N is less than the limiting friction so the body is static. So, a = 0.
Force of friction acting on the body is static friction, f = driving force = 30 N.

On solving we get 3L/4
 

Due to verifying electric field, it experiences an verifying force :-
F=QE=QE_0​sinωt
at maximum amplitude A, it experience a maximum force of:-
F_max​=QE_0​
also, Restoring force in SHM is given by: - F=mω²x
for amplitude, x=A OR,
mω²A=QE_0​
⇒A= QE₀/mω²

A ferromagnetic substance contains permanent atomic magnetic dipoles that are spontaneously oriented parallel to one another even in the absence of an external field. The magnetic repulsion between two dipoles aligned side by side with their moments in the same direction makes it difficult to understand the phenomenon of ferromagnetism. It is known that within a ferromagnetic material, there is a spontaneous alignment of atoms in large clusters. A new type of interaction, a quantum mechanical effect known as the exchange interaction, is involved. A highly simplified description of how the exchange interaction aligns electrons in ferromagnetic materials is given here.

Potential difference between two points is given by

V_a - V_b = W/q₀

Work, W = 2 J

Charge, q₀ = 20 C

Potential difference = 2/20 = 0.1 V

The correct option is C.

Newton's law of cooling states that the heat released by a body with respect to time (or) the rate of heat released is directly proportional to the difference between the body's temperature and the surrounding temperature. 
dH/dt = k(T – Ts) where t = surrounding's temperature and T = temperature of the body 
Consider two bodies A and B, of equal surface areas, such that A's temperature is more that B's temperature and the surrounding temperature is less than both A and B. Then according to Newton's law of cooling A loses more heat to the surroundings when compared B during the same time interval. So, A will cool faster than B.

Ship 2 gets hit first. The time of flight only depends on the y-component of motion, not the x-component.  The higher you throw something up in the air, the more time it spends in the air.  It can also be shown from equation-

y=v_0y t – ½ g t²=0  

    v_0y for projectile μ1 is greater than for μ2.

E= ε_ocos(ωt+π/3) –1
I=I₀sin(ωt)=I₀cos{(π/2)-cot)
 =I0cos(ωt+(- π/2)) —2
By,1 and 2,
Phase difference between E and I,
=ϕ_E-V_I
=(ωt+π/3)- (ωt+(- π/2))
= π/3+ π/2
=5π/6

The mechanism of transfer of heat between two adjacent parts of a body because of their temperature difference is known as conduction. This is the definition of conduction.

The process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the waveforms produced.

From the law of conservation of mechanical energy, the potential energy of a body at height h is converted into kinetic energy when it falls down. So, the magnitude of kinetic energy just before hitting the ground is equal to the potential energy at height h which is mgh.

peak value E_m=2E₀/π
so 2/π value is 0.637
therefore,
E_m=-0.637 E₀

Gravitational Potential V = -GM/R for hollow spherical shell at the centre. If we replace R by R/2 then we get V = -2GM/R. Therefore it decreases.

If R is the radius of a soap bubble and S its surface tension, then the excess pressure inside is 4S/R.

y₁=Asin3 ωt
y₂=A₂cos(3ωt+p/6)
y₂=A₂cosd2
y₁=A sin(3ωt+p/2- p/2)
   =A sin(p/2+3ωt- p/2)
y₁=A cos(3ωt- p/2)  [sin(p/2+θ)=Cosθ]
y1=A1cosd1
d₂-d₁=(3ωt+p/6)- (3ωt- p/2)
=p/6+p/2=2p/3