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

In case I :


In Case II :


From equations (i) and (ii),

The overall work performed in carrying a 2coulomb charge in a circular orbit of radius 3 m around a charge of 10 coulomb is calculated below.
It is a well-known fact that W=qdv.
Here dV is the change in overall potential. In the circular orbit of r potential at each point is similar.
Most significantly, the value of r is 3.  
The value of dv=0 and hence W=q₀=0.

Explanation:External force permanently distubed the equilibrium position of the interatomic ( or intermolecular ) forces between the particles of solid bodies.

If the TE = 0 that means KE + PE = 0
KE = - PE which is enough for the body to leave the system (here, Earth)

When any body or particle moves in circular orbit centripetal force acts on it and to move the object centripetal acceleration is necessary. So, when a satellite moves in circular orbit the centripetal acceleration is provided by the gravitational attraction of the earth.

Resonance occurs when X_L = X_C and the imaginary part of the transfer function is zero. At resonance the impedance of the circuit is equal to the resistance value as Z = R.

Potential = high potential - low potential
so our high potential is 90V and low potential is 10V,
potential = 90-(-10)=100V

Conservation of angular momentum is one of the key conservation laws in physics, along with the conservation laws for energy and (linear) momentum. All the top 3 options use the application conversion of angular momentum.
But the cause of fruit drop can occur due to many reasons such as a severe pest infestation can stress the tree enough to cause fruit drop, Sudden changes in temperature, particularly when high temperatures occur at or shortly after fruit set, can cause fruit drop.

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

Electric field due to a charged ring in given by: -
at point p
∣​E∣​= KQx​ /(R²+x²)^3/2        Q =λ(2πr)
at a large distance, x≫R, so :- R2+x2≃x2
⇒∣​E∣​= K&x​/(x²)^3/2=KQ/x²​=Eαx⁻²
so at a large distance, the ring behaves as a point particle.

As point O is along the length of segments L and M, so the field at O due to these segments will be zero. 
Also, point O is near one end of a long wire.
The resultant field at O, B_R​=B_P​+B_Q​, this field will be into the plane paper.
⇒B_R​= μ₀I/4π​​RO​+​​ μ₀I/4πSO​
But, RO=SO=0.02m
Hence, BR​=2× (μ₀/4π) ​​×(10/0.02)=2×10⁻⁷ (10/0.02) ​=10⁻⁴Wb m⁻²

“A cloth covers a table. Some dishes are kept on it. The cloth can be pulled out without dislodging the dishes from the table.” This is a very common phenomenon and can be seen when the cloth is pulled very quickly. But it can’t be explained by the 3rd Law of Motion.

A photon is massless, has no electric charge, and is a stable particle. In vacuum, a photon has two possible polarization states. The photon is the gauge boson for electromagnetism, and therefore all other quantum numbers of the photon (such as lepton number, baryon number, and flavour quantum numbers) are zero.
 

In case of a meter bridge

For finding the value of R

For finding the value of ΔR

Therefore, R = (60 ± 0.25)Ω

The Measurement of a given quantity is essentially an act or result of comparison between a quantity whose magnitude (amount) is unknown, with a similar quantity whose magnitude (amount) is known, the latter quantity being called a Standard.

Net electric flux (Φ_Net) through the cubic surface is given by,

Where, ∈₀ = Permittivity of free space

= 8.854 × 10⁻¹² N⁻¹C² m⁻²

q = Net charge contained inside the cube = 2.0 μC = 2 × 10⁻⁶ C

∴

= 2.2 × 10⁵ N m² C⁻¹

The net electric flux through the surface is 2.2 ×10⁵ N m²C⁻¹.

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.

Parachute bails out at height H from ground. Velocity at A:

The formula for the MOI of a uniform semicircular ring about a perpendicular line is ½ Mr²

Force on the body placed on Earth's surface is
F=GMm/R^2​
But, F=mg hence,
mg=GMm/R²​
where, variables have their usual meanings.
gR²=GM
Now, force on the body at geo-potential  height say h (altitude) where the acceleration due to gravity is 25% of that at the earth's surface i.e.
25g/100​=g/4​
Hence, we can write
g/4​=GM/(R+h)²
 
g/4​= gR²​ /(R+h)²
 
(R+h)²=4R²
Taking roots for both sides we get
R+h=2R
h=R
 

The relation between actual time and given time is:
Actual time=11:60 −given time
Actual time=11:60−3:25=8:35

Use equation of kinematics: v = u + at
Initial velocity, u = 3i + 4j
Acceleration, a = 0.4i + 0.3j
Time, t = 10s
v = (3i + 4j) + 10(0.4i + 0.3j)
v = (3i + 4j) + (4i + 3j)
v = 7i + 7j
|v| = √(7² + 7²) = 7√2

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.

School principal fulfils many roles and dealing with students' disruptive behaviour is among the least preferred by them. So, the teacher must try to discipline the students using various means like assigning responsibility to the undisciplined, finding out the underlying cause of his behaviour, and so on. Only after she has done everything without any effect on the student should she send the student to the principal.

Allowing the students to make mistakes is important for them to learn problem solving skills, to be responsible and to make certain decisions on their own.
If students are instructed on everything and are not allowed to make mistakes, they may lose self confidence, stop trying new things and even become rebellious.

Agenda 21 is an extensive arrangement of action to be made universally, broadly and locally by associations of the United Nations System, governments and major groups in each territory in which human affects the Earth.

According to the sequence in the dictionary: 

The correct order of the given words is:

2. Arrange

1. Arrest

3. Arrogant

4. Arrow

Hence, the correct answer is "2, 1, 3, 4".

Additional Information

1. First of all, check the common letter in all.

2. Arrange them according to the alphabet they come first. 

3. When common letters are arranged, then go for the rest.