BITSAT Physics: Questions 7 - 12 of 158

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Question number: 7

» Oscillations and Waves » Resonance

MCQ▾

Question

Resonance is a special case of –

Choices

Choice (4) Response

a.

Damped vibration

b.

Natural vibration

c.

Force vibration

d.

Un – damped vibration

Question number: 8

» Atoms and Nuclei » Half Life and Mean Life

MCQ▾

Question

Half – life of a radioactive material depends on –

Choices

Choice (4) Response

a.

Temperature

b.

Disintegration medium

c.

Nature of material

d.

Material’s amount

Question number: 9

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Lightning was discovered by –

Choices

Choice (4) Response

a.

Ohm

b.

Franklin

c.

Thomson

d.

Faraday

Question number: 10

» Rotational Motion » Radius of Gyration

MCQ▾

Question

The radius of gyration of a disc of mass 50g and radius 2.5cm about an axis passing through its centre of gravity and perpendicular to the plane is –

Choices

Choice (4) Response

a.

1.76cm

b.

0.52cm

c.

6.54cm

d.

3.54cm

Question number: 11

» Magnetic Effects of Current and Magnetism » Magnetic Moment

MCQ▾

Question

What is the magnitude of magnetic force per unit length of a wire carrying a current of 5A and making an angle of 30° with direction of a uniform magnetic field of 0.1T ?

Choices

Choice (4) Response

a.

0.55Nm

b.

0.35Nm

c.

0.45Nm

d.

0.25Nm

Question number: 12

» Electronic Devices » Semiconductors

MCQ▾

Question

In a hydrogen discharge tube, it is observed that through a given cross – section 3.13×1015 electrons are moving from right to left and 3.12×1015 protons are moving from left to right. What is the electric current in the discharge tube and what is its direction?

Choices

Choice (4) Response

a.

1mA towards right

b.

2mA towards left

c.

2mA towards right

d.

1mA towards left

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