Physics Test 51

Result

Physics Test 51

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Question 1
4 / -1

Direction:In the given figure, a hollow spherical capacitor is shown. The electric field will not be zero at

A
r < r₁

B
r > r₂

C
r < r₂

D
r₁ < r < r₂

Solution

The electric field of a hollow spherical capacitor is localized in between the inner and outer surfaces of the spherical conductor. Therefore, at point r₁ < r < r₂,the electric field will not be zero.

Hence, the correct option is (D).
Question 2
4 / -1

The potential energy of a 1 kg particle, free to move along the x-asis, is given by The total mechanical energy of the particle is 2 J. Then, the maximum speed (in m/s) is

A
2

B
3/√2

C
√2

D
1/√2

Solution

Velocity of a particle will be maximum when its kinetic energy is maximum and corresponding to this, the potential energy will be minimum.
Question 3
4 / -1

The electron in a hydrogen atom makes a transition n₁ → n₂, where n₁ and n₂ are the principal quantum numbers of the two energy states. Assume Bohr's model to be valid. The time period of the electron in the initial state is eight times that in the final state. What are the possible values of n₁ and n₂?

A
n₁ = 8, n₂ = 1

B
n₁ = 4, n₂ = 2

C
n₁ = 2, n₂ = 4

D
n₁ = 1, n₂ = 8

Solution
Question 4
4 / -1

A satellite is revolving in a circular orbit distance of 2620 km from the surface of the earth. The time period of the revolution of the satellite is (Radius of the earth = 6380 km, mass of the earth = 6 × 10²⁴ kg, G = 6.67 × 10¹¹ N - m²/kg².

A
2.35 hours

B
5.3 hours

C
6.3 hours

D
9.2 hours

Solution
Question 5
4 / -1

The first law of motion is also known as the law of

A
Inertia

B
Momentum

C
Force

D
Impulse

Solution

Newton's first law of motion is also known as the law of inertia. Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.
Question 6
4 / -1

Given that the values of inductance L = 1μH and capacitance C = 0.01μF. Calculate the wavelength of electromagnetic wave generated is?

A
68.08 × 10^-6 m

B
76.33 × 10^-6 m

C
59.53 × 10^-6 m

D
12.53 × 10^-6 m

Solution
Question 7
4 / -1

A string of negligible mass going over a clamped pulley of mass m supports a block of mass M as shown in the figure. The force on the pulley by the clamp is given by

A
√2 Mg

B
√2 mg

C

D

Solution
Question 8
4 / -1

A metal plate of area 10³ cm² rests on a layer of oil 6 mm thick. A tangential force of 10² N is applied on it to move it with a constant velocity of 6 cm s¹. The coefficient of viscosity of the liquid is

A
0.1 poise

B
0.5 poise

C
0.7 poise

D
0.9 poise

Solution
Question 9
4 / -1

The cyclotron frequency of an electron grating in a magnetic field of 1 T is approximately

A
28 M H z

B
280 M H z

C
2.8 G H z

D
28 GHz

Solution
Question 10
4 / -1

A round disc of moment of inertia I₂ about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I₁ rotating with an angular velocity ω about the same axis. The final angular velocity of the combination of discs is

A

B
ω

C

D

Solution