Bihar PGT Physics Mock Test - 2 - Bihar PGT/TGT/PRT MCQ

The passage seems to center around the theme of recession. The first sentence should be P because it introduces and defines 'recession'. The next sentence would be R which gives the technical definition of 'recession'. The next two sentences are about the effects of a recession. Out of these S would come before Q as Q exemplifies S. Therefore, the correct sequence is PRSQ.

सारस पुल्लिंग शब्द है।

वे संज्ञा शब्द जो हमें पुरुष जाति के व्यक्ति, वस्तु आदि का बोध कराते हैं, वे पुल्लिंग शब्द कहलाते हैं। जैसे:

बकरा, घोड़ा, लड़का, आदमी, शेर, हाथी, भेड़िया, खटमल, बन्दर, कुत्ता, बालक, शिशु, पत्रकार, राजा, राजकुमार, सारस आदि।

'भारतीय' शब्द का बहुवचन 'भारतीयों' है।

भारत देश के निवासियों को भारतीय कहा जाता है। भारत को हिन्दुस्तान नाम से भी पुकारा जाता है और इसीलिये भारतीयों को हिन्दुस्तानी भी कहतें है।

जो शब्द अन्य शब्दों के योग से बनते हैं, परन्तु एक विशेष अर्थ के लिए प्रसिद्ध होते हैं, उन्हें योगरूढ़ शब्द कहते हैं।

पीताम्बर शब्द यौगिक तो है परन्तु इसका अर्थ रूढ़ होने की वजह से इसका अर्थ विशेष हो जाता है। जैसे- जो पीला वस्त्र धारण करते हैं अर्थात भगवान् कृष्ण।

जिसमें पहला पद संख्यावाचक हो और जो किसी समूह विशेष का बोध कराए उसे द्विगु समास कहते हैं।

जैसे - सप्ताह - सात दिनों का समूह, नवग्रह - नौ ग्रहों का समूह।

The correct answer is option 4.

Key Points

Article 75 of the Indian Constitution mentions that a Prime Minister is one who is appointed by the President.

• There is no specific procedure for his election or appointment.
• Article 74(1) states that there shall be a Council of Ministers with a Prime Minister at the head to aid and advise the President. 
• President of India appoints a person as the Prime Minister who is either the leader of the party which holds a majority of seats in the Lok Sabha or is a person who is able to win the confidence of the Lok Sabha by gaining the support of other political parties.

• All other ministers are appointed by the President on the advice of the Prime Minister.

Thus, it is clear that while appointing the Prime Minister, the President selects the leader of the alliance or party that has the support of the majority in Lok Sabha.

Additional Information

• President can also appoint Prime Minister at his own discretion but only when no party has a clear majority in the Lok Sabha. 

Preparing the family tree using the following symbols:

On decoding L θ Z β T means L is the mother of Z and Z is the sister of T.

i) L is mother of T → True
ii) L is father of T → False (as L is mother of T) 
iii) T is father of L → False (as T is either son or daughter of L)
iv) Z is daughter of T → False (as Z is sister of T)
Hence, 'L is mother of T' is the correct answer.

The correct answer is the Election Commission of India.

• India has a multi-party system, where political parties are classified as National, state, or regional level parties.
• The status of the party is accorded by the Election Commission of India.

• Election Commission of India is a permanent Constitutional Body.
• The Election Commission was established in accordance with the Constitution on 25th January 1950.
• Originally the commission had only a Chief Election Commissioner. It currently consists of Chief Election Commissioner and two Election Commissioners.

• ​Constitutional Provision
  • Mentioned Under Part - XV.
  • Related Articles lies between 324 to329.
• The Constitution provides ECI, the power of superintendence, direction & control of elections to
  • Parliament 
  • State legislature
  • The office of president of India 
  • The Office of the  vice-president of India

Concept:

• Plants have different types of roots.
• Some store food, some breathe some hang from the branches.

Explanation:

• Roots are the underground structures that help in the absorption of water and minerals provide a proper anchorage to the plant parts, storage of reserve food material (Carrot, Radish), and synthesis of PGR (plant growth regulators).
• Sometimes roots get modified to perform different functions like storage of food, respiration, climbing, etc.
• These types of roots are called modified roots.
• Examples - prop root of the Banyan tree for providing support, Pneumatophores of Rhizophora, and Mangrove plants for respiration.

So, these statements are correct.

• To give support to the plant.
• To store food.
• To absorb water and minerals.

Thus, roots do not function to provide humus.

We know that,
Velocity of efflux is given as v = √2gh
As the water level in the tank decreases, the velocity with which water comes out from the opening decreases due to decrease in pressure with height. Hence, the time taken to empty the tank increases with decrease in velocity and height of water level.
Hence C is the correct answer.

In series connection of cells total internal resistance=nr total resistance of circuit=nR current is same potential difference is different so,I=nv/nR+nr I=V/R+r current is same as before in parallel connection of cells total internal resistance=r/n total resistance of circuit=R/n total current=nI potential difference is same nI=V/r/n+R/n I=V/R+r current is same as before.

The radiation of infrared rays of the sun keeps the earth's surface warm even at night due to the greenhouse effect of the atmosphere. Heavy gases likely CO_2​ present in the earth's atmosphere reflect infra-red radiation back towards the earth's surface. Due to which earth's atmosphere becomes richer in infrared radiation. If the atmosphere is absent then earth temperature falls off.

We know that PE + KE = TE = constant
Hence at the extremis TE = PE = ½ kz²  
Where z is amplitude and k is shm constant.
Thus when KE = ⅓ PE
We get PE = ¾ TE =  ½ kz²
Hence we get  ½ kx² = ¾  ½ kz²
We get x/z = √3/4 
= 1.73 / 2
= .87
Thus we get x is 87 percent of the amplitude.

In 9s, the distance travelled = 4A × 3 = 12A 

Imagine, now it is at

equation of alternating voltage , E = 200√2sin(100t)
compare this equation with E₀sin(ωt)
so,  E₀=200√2 volts
ω= 100 rad/s
now, E_rms=E₀/√2
= 200√2/√2 = 200 volts .
given, capacitance of capacitor, C = 10^-6 F
so, reactance of capacitor,  X_C=1/ω_C
=1/(10^-6x100)
=10⁴
so, the reading of Ammeter, I=E_rms/X_C
= 200/10⁴ A = 20 × 10^-3 A = 20mA
hence, option (b) is correct.

The number of images formed when two mirrors are inclined to each other is given by :
n=(360/θ -1)
here θ= 90°[since walls are perpendicular]
so, number of images=n=360/90-1
=4-1
=3
These 3 images are formed by a combination of two adjacent walls with the object itself acts as objects for the ceiling mirror. So totally 4 images are formed.
Hence total number of images formed are 4+3= 7
 

Induced emf= d(flux)/dt​=R[dq​/dt]
⇒Δq= Δ(flux)​/R=2BA/R​

Let q charge is situated at themidposition of the lineAB.The distance between AB is x. A and B be the positions of charges Q and Q respectively.

We know, the gravitational force 
,
This is valid when R is the centre to centre distance between the two masses M and m.
At a distance r < R, the mass of Earth cannot be taken as M.

The new mass (M'):
The mass of earth will be contained for a radius r. Let us assume that the mean density of the earth is ρ and that earth is a sphere with a radius equal to the distance r. We know, mass = density × volume

Therefore the gravitational force, F = 

Hence the gravitational force, F ∝ r

Self-inductance is given by: v(t)=L (di/dt)
From this we have: L=v (dt/di)
 
v/di has the dimensions of R
 
So, L=Rdt hence L/R=dt, same units as that of time.
 

Since mud or putty have no gross tendency to regain their previous shape & they get permanently deformed, they are close to ideal plastics.

1. Perfectly plastic bodies are those that retain their distorted shape or size after external pressures applied to them have been released.
2. Partially elastic bodies are those that partially return to their former shape or size when external forces are eliminated.
3. The shape or size of mud or putty is now altered when force is applied, and the body does not return to its original state when the force is removed. Only perfectly plastic bodies, as already established, exhibit this feature.
4. Additionally, many elasticity moduli types are used to measure elasticity.
5. The ratio of stress to strain given to a body under various variations in dimension is what makes up an elastic modulus.
6. Young's Modulus, Shear Modulus, and Bulk Modulus are the three forms of elastic moduli. Since Young's modulus or longitudinal stress by strain for mud or putty is almost zero, they are theoretically proven to be almost ideal plastic bodies.

Hence, putty or mud is an example of a perfectly plastic body.

Stored elastic potential energy of spring =1/2​kx2 where x is compression or elongation of spring from its natural length. In this position the spring can do work on the block tied to it, which is equal to 1/2​kx2, so both option (a) & b are correct.

CONCEPT:

Conservative force: 

• A force is conservative if the work done by the force in displacing an object from one point to another point is independent of the path followed by the object and depends only on the endpoints.
  • Electrostatic forces, gravitational forces, elastic forces, magnetic forces, etc and are examples of a conservative force.

Non-conservative forces: 

• A force is said to be non-conservative if work done by or against the force in moving a body from one position to another, depends on the path followed between these two positions.
  • Example:  Frictional force, Viscous force, Airdrag, etc.

EXPLANATION:

• If a body is moved from position A to another position B on a rough table, work done against frictional force shall depend on the length of the path between A and B and not only on the position A and B.
• Therefore, in non-conservative force work done by or against the force in moving a body from one position to another, depends on the path followed between these two positions. Therefore option 2 is correct.

Explanation:A displacement is vector that is the shortest path length from the initial to the final position of the body. It is not always eqaul to path length. It can be zero and -ve also.

The direction of propagation of the electromagnetic wave is always perpendicular to the plane in which
So, the direction of the propagation of the wave, 
Hence, option B is the correct answer.

If radian correction is not considered in specific heat measurement. The measured value of specific heat will be more than its actual value.

When a light travels from one medium to another then deviation in the path of light known as refraction. And in the prism surrounding medium is air and material medium is glass due to the change of medium refraction will occur in prism.

∵ V = (4/3)πr³
% error is volume = 3 × error in radius = 3 × 1 = 3%