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NAT I Engineering Physics MCQs With Answers

Question # 1

The half life of a radio-isotope is 5 years The fraction of atoms decayed in this substance after 15 years will be

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3/4

7/8

5/8

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Question # 2

In a simple harmonic motion (SHM) which of the following does not hold?

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The force on the particle is maximum at the ends

The acceleration is minimum at the mean position

The potential energy is maximum at the mean position

The kinetic energy is maximum at the mean position.

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Question # 3

The modulus of rigidity of a liquid is

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Zero

Infinity

A value not one of those mentioned above

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Question # 4

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R²

1/R

(1/R)²

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Question # 5

A particle moving in a magnetic field has increase in its velocity then its radius of the circle

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Decreases

Increases

Remains the same

Becomes half

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Question # 6

Two electric bulbs of 200 W and 100 W have same voltage.If R1 and R2 be their resistance respectively then

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R₁ = 2R₂

R₂ = 2R₁

R₂ = 4R₁

R₁ = 4R₂

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Question # 7

In a Millikan's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19 C. The number of excess electrons on the drop is

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3.9

4.2

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Question # 8

The number of translation degrees of freedom for a diatomic gas is

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Question # 9

What is the ratio of r.m.s velocity for O₂ to H₂?

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1/4

√4 : 1

1 : √4

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Question # 10

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentum

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