Physics Past Questions and Answers

Which of the following is not a consequence of a force field?

A Wieght
B Surface tension
C Gravitational pull
D Magnetic force
E Electric force

Question 77:

A boy pulls a nail from the wall with a string tied to the nail. The string is inclined at an angle of 60^o to the wall. If the tension in the string is 4N, what is the effective force used in pulling the nail?

A 2âˆš3 N
B 4 N
C 4âˆš3 N
D 8 N
E 2 N

Question 78:

Which of the following is used to determine the relative density of the acid in a car battery?

A Hypsometer
B Hygrometer
C Manometer
D Hydrometer
E Spectrometer

Question 79:

A block of material of volume 20cm^-3 and density 2.5gcm^-3 is suspended from a spring balance with half the volume immersed in water. What is the reading of the spring balance? (Density of water = 1.0gcm^-3).

A 8g
B 25g
C 30g
D 40g
E 50g

Question 80:

A piece of cork floating on water is acted upon by the forces of...

A Weight and viscosity
B Weight and upthrust
C Upthrust and viscosity
D Weight only
E Upthrust only