Physics Past Questions and Answers

One of the following readings represents the measurement of the length of a metal rod using vernier callipers, Taking the reading accuracy into consideration, the most likely one is

A 5.15cm
B 5.165cm
C 5.0cm
D 5.160cm
E 5cm

Question 197:

When equal weights of iron and water are subjected to equal supply of heat, it is found that the piece of iron become more hotter than water after a short time because

A The specific heat of iron is higher than that of water
B Iron is in solid form
C Water is in liquid form
D The specific heat of water is higher than that of iron
E The specific heat of iron is infinite

Question 198:

The tyre pressure of a car was found to be 150cmHg in the morning at a temperature of 27°C. Hard driving in the afternoon raised the temperature of the tyres by 57°C. The tyre pressure had by the afternoon was

A Increased by 15.0cm Hg
B Decreased by 15.0cm Hg
C Increased by 22.50cm
D Decreased by 22.50cm Hg
E Remained constant

Question 199:

The echo of a sounder from the bottom of an ocean is heard 2.5 seconds later. If the speed of sound in water is 1,400ms<sup style='font-size: smaller;'>-1</sup>, the depth of the ocean is

A 1,750m
B 3,500m
C 1,400m
D 2,800m
E 2,100m

Question 200:

An electric iron is rated at 1000watts, 250v. The corresponding maximum resistance and accompanying current is

A 62.5A, 4.0\(\Omega\)
B 16.0A, 62.5\(\Omega\)
C 62.5A, 16.0\(\Omega\)
D 4.0A, 62.5\(\Omega\)
E 4.0A, 250\(\Omega\)