MCQS of Physics for NTS Set 4

The average power dissipation in a pure capacitor in AC circuit is

Zero

2CV²

1/2 CV²

CV²

Light appears to travel in straight lines since

Its velocity is very large

It is reflected by the atmosphere

Its wavelength is very small

It is not absorbed by the atmosphere

Which one of the following is a simple harmonic motion?

Ball bouncing between two rigid vertical walls

Wave moving through a string fixed at both ends.

Particle moving in a circle with uniform speed.

Earth spinning about its own axis

If the period of oscillation of mass (M) suspended from a spring is 2s, then the period of mass 4M will be

2 s

4 s

1 s

3 s

A train of 150 m length is going towards north direction at a speed of 10 ms^-1 A parrot flies at a speed of 5 ms^-1 towards south direction parallel to the railway track,The time taken by the parrot to cross the train is equal to

15 s

10 s

12 s

8 s

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

R/2

R/3

R/4

R

In a capacitive circuit

Current and voltage are in same phase

Sometime current and sometime voltage leads

Voltage leads current by phase of ?/2

Current leads voltage by phase of ?/2

Which of the modulus of elasticity is involved in compressing a rod to decrease its length?

Bulk modulus

Young’s modulus

None of the above

Modulus of rigidity

Two bodies of masses m₁ and m₂ have equal momentum their kinetic energies E₁ and E₂ are in the ratio

m₁² :m₂²

?m₁ : ?m₂

m₂: m₁

m₁ : m₂

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

1

4-Mar

5/8

7/8