Free Printable 12 physics

1.

The K.E. of a body is 3 J and its M.I. is 6 kg m². Then its angular momentum will be

a)

3 kg m²/s

b)

6 kg m²/s

c)

4 kg m²/s

d)

5 kg m²/s

2.

The coefficient of absorption and coefficient of transmission are 0.50 and 0.25 respectively. If 200 calories of radiant heat is incident on the surface of the body, the quantity of heat reflected will be

a)

140 Cal

b)

150 Cal

c)

50 Cal

d)

200 Cal

3.

What is the value of shunt resistance that allows 20% of the main current through a galvanometer of 99 Ω?

a)

20.75Ω

b)

24.75Ω

c)

28.75Ω

d)

30.75Ω

4.

The direction of induced emf due to changing magnetic flux is given by

a)

Coulomb

b)

Newton

c)

Faraday

d)

Lenz

5.

Which gate is the most basiclogic gate for the digital circuits?

a)

OR

b)

AND

c)

NOT

d)

NAND

6.

A simple pendulum is suspended from the roof of a train. If the train is moving with an acceleration 49 cm/s². Then the angle of inclination of the string about vertical will be

a)

20^o

b)

Zero

c)

30^o

d)

3⁰

7.

An ideal transformer has 100 turns in the primary and 250 turns in the secondary. The peak value of the ac is 28 V. The rms secondary voltage is nearest to

a)

100V

b)

70V

c)

50V

d)

40V

8.

The magnetic dipole moment of current loop is independent of

a)

Number of turns

b)

area of loop

c)

magnetic field in which it is lying

d)

current in the loop

9.

The null point of a potentiometer wire will shift beyond the potentiometer wire if

a)

emf of driving cell is low

b)

emf of accumulator is high

c)

length of wire is small

d)

length of wire is large

10.

A sonometer wire vibrates with three nodes and two antinodes. The corresponding mode of vibration is

a)

the first overtone

b)

the second overtone

c)

the third overtone

d)

the fourth overtone

11.

Visible light comprises of wavelength in the range

a)

100 – 400 nm

b)

200 – 300 nm

c)

300 – 700 nm

d)

400 – 700 nm

12.

The sum of all energies of all molecules in a body is called as

a)

kinetic energy

b)

potential energy

c)

internal energy

d)

atomic energy

13.

In a given process for an ideal gas, W=0 and Q < 0. Then for the gas,

a)

the temperature will decrease

b)

the volume will increase

c)

the pressure will remain constant

d)

the temperature will increase

14.

In the photoelectric effect, the velocity of the ejected electrons depends upon the nature of the target and

a)

intensity of incident light

b)

frequency of incident light

c)

the time for which the light has been incident

d)

both (A) and (C)

15.

Photoelectric effect is the emission of

a)

protons

b)

photons

c)

electrons

d)

neutrons

16.

Surface tension is due to

a)

Frictional forces between molecules

b)

Cohesive forces between molecules.

c)

Adhesive forces between molecules

d)

Gravitational force

17.

The surface tension of a liquid is T. The increase in its surface energy on increasing the surface area by A

a)

$\frac{A}{T}$

b)

$A^2$ T

c)

AT

d)

$A^{2^{ }}$ $T^2$

18.

The potential energy of a molecule on the surface of a liquid compared to one inside the liquid is

a)

Zero

b)

smaller

c)

greater

d)

the same

19.

A student connects a battery to a 30 Ω resistor. She measures a current of 0.20 Amps. What is the voltage supplied by the battery?

a)

30.2 V

b)

0.0067 V

c)

150 V

d)

6.0 V

20.

movement of pandulem is -------- motion

a)

rectilinear

b)

periodic

c)

curvilinear

d)

vibratory

21.

2. Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.

a)

10 N

b)

20 N

c)

30 N

d)

40 N

22.

3. Centripetal acceleration acts towards the ___________ of the circular motion

a)

center

b)

outside

c)

circumference

d)

radius

23.

The visible lines from hydrogen are all members

of the ____.

a)

Lyman series

b)

Balmer series

c)

Paschen series

d)

Lyman and Paschen series

12 physics

Total questions: 23

Worksheet time: 13mins

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