Generate Quiz 6A5677F67FF01

1 / 20

If the wavelength of a transverse is 2cm and the period is 2 seconds then the wave speed in CGS is

Elimination Tool

A) 0.1cms-1

B) 0.2cms-1

C) 11 cms-1

D) 1 cms-1

2 / 20

Nucleus with an excess of neutrons may decay radioactivity with the emission of:

Elimination Tool

A) a neutron

B) a proton

C) an electron

D) a positron

3 / 20

The following question belongs to the topic of motion:

NTS 2012
Physics
Forces and Motion
Displacement, Velocity and Acceleration
Elimination Tool:

A) Average velocity

B) Uniform velocity

C) Instantaneous velocity

D) Variable velocity

4 / 20

If Cv= 5/2 R , Cpwill be:

Elimination Tool

A) 2 / 5 R

B) 2 / 7 R

C) 5 / 2 R

D) 7 / 2 R

5 / 20

A transistor is connected in a common emitter configuration. The collector supply is 8V and the voltage drop across a resistor of 800Ω in the collector circuit is 0.5 V. If the current gain factor α is 0.96, then the base currents are:

20µA

26µA

30µA

35µA

6 / 20

A circuit that adds positive or negative D.C. voltage to an input sine wave is called:

Elimination Tool

A) Clamper

B) Clipper

C) Diode clamp

D) Limiter

7 / 20

Which rays are used in LASER?

Electromagnetic radiation

Black body radiation

Alpha rays

Beta rays

8 / 20

For projectile motion, in the absence of air resistance:

Elimination Tool
Hints

A) Horizontal acceleration is zero

B) Vertical acceleration is zero

C) Horizontal force is constant

D) Vertical speed is constant

9 / 20

Mass number A refers to …………..

Number of electrons

Number of nucleons

Number of neutrons

Number of protons

10 / 20

When brakes of a car are applied, angular velocity of a flywheel reduces from 900 cycle / min to 720 cycle / min in 6 sec. Angular retardation is:

Elimination Tool

A) 𝝅 rad/s2

B) 9 𝝅 rad/s2

C) 8 𝝅 rad/s2

D) ⅔ 𝝅rad / s2

11 / 20

A circuit in which there is a current of 10 amperes is changed so that the current falls to zero in 0.5 seconds. If an average e.m.f. of 400 volts is induced, what is the self-inductance of the circuit?

10 Henrys

20 Henrys

30 Henrys

40 Henrys

12 / 20

If two point charges of charge q1 and q2 are placed at distance d. The force between them is proportional to:

d

d2

1/d

1/d2

13 / 20

A mass of 20 kg is lifted from the floor to a height of 2m in 4.9 sec. Calculate the power in Watts.

Elimination Tool

A) 60 W

B) 80 W

C) 100 W

D) 120 W

14 / 20

F = e(v x B) is valid for:

Elimination Tool

A) Electron

B) Proton

C) Neutron

D) All of these options are correct

15 / 20

London dispersion forces are the only forces present amongst ?

Atoms of helium in gaseous state at high temperature.

Molecules of water.

Molecules of solid iodine.

Molecules of HCl gas.

16 / 20

The half-life of a radioactive substance is 5 minutes. The amount of substance decayed in 20 min will be:

Elimination Tool

A) 93.75 %

B) 6.25 %

C) 25 %

D) 75 %

17 / 20

Magnetic field is very strong where field lines are

Elimination Tool

A) Zero

B) Far apart

C) Very close

D) None of these

18 / 20

In a uniform electric field, which statement is correct?

Elimination Tool

A) All charged particles experience the same force.

B) All charged particles move with the same velocity.

C) All electric field lines are directed towards positive charges

D) All electric field lines are parallel

19 / 20

A solid sphere of mass M and radius R rolls on a horizontal surface without slipping. The ratio of rotational kinetic energy to total kinetic energy is:

Elimination Tool
Hints
Option

A) 1:2

B) 2:5

C) 2:7

D) 7:10

20 / 20

Red light is used in photographic dark room because of:

Elimination Tool

A) More frequency, less wavelength

B) Less frequency, less wavelength

C) Less frequency. more wavelength

D) More frequency. more wavelength

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