Physics Past Questions and Answers

Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube?

A Metre rule
B A pair of callipers
C A micrometer screw gauge
D A tape rule
E A set square

Question 112:

A particle of mass 2.5 x 10^-6kg revolving around the earth has a radial acceleration of 4 X 10⁷ ms^-2. What is the centripetal force of the particles?

A 6.25 x 10^-14N
B 1.60 x10^-13N
C 5.00 x 10N
D 1.00x10²N
E 2.00x1O²N

Question 113:

An oscillating pendulum has a velocity of 2ms^-1 at the equilibrium position O and velocity at same point P. Using the diagram above, calculate the height of P above O. (Take g = 10ms²)

A 5.0m
B 2.0m
C 0.4m
D 0.2m
E 0.1m

Question 114:

Which of the following are contact forces? I. Force of tension II. Force of fiction, III. Magnetic force III Force of reaction.

A I,II and III only
B I, II and IV only
C I, III and IV only
D II, III and IV only
E L and IV only.

Question 115:

A plane inclined at an angle at 30^o to the horizontal has an efficiency of 50%. The force parallel to the plane required to push a load of 120 N uniformly up the plane is

A 40âˆš3N
B 60N
C 120N
D 200N
E 240N