Physics Past Questions and Answers

The smallest unit on the sleeve of a micrometer screw gauge is 0.5mm. There are fifty divisions on the thimble of the screw gauge.
What is the smallest length that can be measured with this instrument?

A 0.05cm
B 0.01cm
C 0.005cm
D 0.001cm
E 0.0001cm

Question 17:

The length of a side of a metallic cube at 20° C is 5.0cm. Given that the linear expansively of the metal is 4.0 × 10^-5K^-1, find the volume of the cube at 120° C ____________

A 124.50cm³
B 125.00cm³
C 126.00cm³
D 126.25cm³
E 126.50cm³

Question 18:

A boy moving with a velocity of 3 ms^-1 is brought to rest by a constant force after travelling 15m. Calculate the retardation.

A 0.15ms^-2
B 0.30ms^-2
C 0.60ms^-2
D 3.33ms^-2
E 6.66ms^-2

Question 19:

A block of a substance X will sink in a liquid V but float liquid Z. Which of the following statements is NOT correct about the densities of the three substances?

A Density of liquid Z is greater than that of X
B Density of liquid V is less than that of liquid X
C Density of liquid Y is less than that of liquid Z
D Liquid Z has the greatest density of all the three substances.
E If liquids Y and Z do not mix, liquid Z will float on liquid Y.

Question 20:

I. A scalar quantity has only magnitude
II. A scalar quantity has both magnitude and direction
III. A vector quantity has both magnitude and direction
IV. A vector quantity has only magnitude.

Which of the above statement is/are correct?

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