Physics Past Questions and Answers

Which of the following will reduce the frequency of oscillation of a simple pendulum?

A Increasing the mass of the bob
B Decreasing the mass of the bob
C Increasing the length of the string
D Decreasing the length of the string
E Increasing the amplitude of oscillation

Question 247:

A force of 20 N applied parallel to the surface of a horizontal table, is just sufficient to make a block of mass 4kg move on the table. Calculate the coefficient of friction between the block and the table. (g = 10ms²)

A 0.05
B 0.20
C 0.50
D 0.80
E 2.00

Question 248:

A barometer can be used in determining the I. height of a mountain II. depth of a mine III. dew point. Which of the following is/are correct?

A I, II and III
B II and III only
C I and III only
D I and II only
E III only

Question 249:

A body of mass 5kg falls from a height of 10m above the ground. What is the kinetic energy of the body just before it strikes the ground? (Neglect energy losses and take gas 10ms²)

A 5J
B 25J
C 250J
D 500J
E 625J

Question 250:

Steel bars, each of length 3.0 m at 28°C, are to be used for constructing a rail line. If the linear expansivity of steel is 1.0 x 10^-5°C, what is the safety gap that must be left between successive bars if the highest temperature expected is 40^oC?

A 1.2 x 10^-1cm
B 8.4 x 10^-2cm
C 7.2 x10^-2cm
D 3.6 x 10^-2cm
E 1.8 x 10^-2cm