Defence Screening Test - Physics for HTS Testing Exam Exams

Question 1

A body is moved along a straight line by a machine giving constant power the distance moved by the body in time t is proportional to :

Question 2

The momentum of inertia of a ring is 0.40 kg

. If it is making 2100 rev/min. what torque is required to stop it in 2 second

Question 3

A body has weight W1 above a mountain, W2 on sea level and W3 below mine. Then

Question 4

A body of mass m slides down an inclined plane making an angle of 45 degree with the horizontal. If the coefficient of the friction between the body and the plane is 0.3, the acceleration of the body is equal to

Question 5

The displacement time graph for the two-particle A and B are straight lines inclined at angles 30

and 60

with the time axis. The ratio of the velocities

will be:

Question 6

A surface tension experiment performed on earth shows that a liquid can rise in a capillary tube upto 0.23 m. If the apparatus is placed in n artificial satellite, the liquid will rise upto:

Question 7

when the length of the vibrating segment of a sonometer wire is increased by 1%, the percentage change in its frequency is

Question 8

The velocity of a body falling freely acceleration due to gravity varies as

where h is height fallen by the body the value of p and q:

Question 9

A light spring balance hangs from the hook of the other light spring balance and a block of mass M kilograms hangs from the former one. Which of the following statements about the scale reading is true?

Question 10

A satellite moves in an elliptical orbit about a planet. Its maximum and minimum velocities of the satellite are 30,000 m/s and 1000 m/s respectively. What is the minimum distance of the satellite from the planet if the maximum distance is

km?

Question 11

A spring has a spring constant of 450 N/m and an extension of 6 cm. A work of 1.44 J is done on the spring to change the extension. Find the new extension of the string.

Question 12

A tuning fork of frequency 256 Hz makes 32 vibrations. Find the distance travelled by the sound in air. (v_air = 320 m/s)

Question 13

A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg . What is the work done in pulling the entire chain on the table?

Question 14

A force

=(5i + 3j +2k)N is applied over a particle which displaces it from its origin to the point

m. the work done on the particle in joules is

Question 15

When a dipole is placed in a uniform magnetic field, it experiences a :

Question 16

A charged oil drop is suspended in a uniform field of

V/m so that it neither falls nor rises. The charges on the drop will be ( take the mass of the charge as 9.9

and g = 10 m/s²)

Question 17

Kirchhoff's first law (

) and second law

. Where symbols have their usual meanings, are, respectively, based on

Question 18

The equivalent capacitance between X and Y can be achieved by replacing the capacitor network by just a single capacitor already being used in the network. Find which capacitor it is.

Question 19

The relationship between the temperature T (on x axis) and magnetic susceptibility χ_m (0n y axis) is given as

Identify the type of magnetic material.

Question 20

The ratio of the amount of heat necessary to heat a known mass of water from 0

C to 50

C and convert the same mass of ice into steam, will be:

Question 21

A ball A has twice the diameter as another ball B of the same material and with the same surface finish. A and B are both heated to the same temperature and allowed to cool radiatively. Then the

Question 22

A system goes from A to B via two processes I and II, as shown in the figure. If

are the changes in the internal energies in the processes I and II, respectively, then

Question 23

The fossil bone has a ¹⁴C :¹²C ratio, which is

of that in a living animal bone. If the half-life of ¹⁴C is 5730 years, then the age of the fossil bone is

Question 24

Radiation of wavelength 450 nm is incident on 4 different metal surfaces. Their work functions (in eV) are given. Which of these will not give out photo electrons once the radiation falls on them?

Question 25

An electron-positron pair is produced by the liquidation of a gamma-ray photon of 2.26 MeV. what is the kinetic energy of the each charged particle?