Physics Past Questions and Answers

Consider a thick glass tumbler and a thin glass tumbler which are made of the same kind of glass. Some hot liquid is poured into them. Which of the following statements is correct?

A The thick tumbler is less likely to crack because it is stronger
B The thick tumbler is less likely to crack because it insulates the heat beter, glass being a poor conductor of heat
C Both tumblers are equally likely to crack because they are made of the same kind of glass
D The thick tumbler is more likely to crack because uneven expansion persists for a longer time within the thicker glass
E The thick tumbler is more likely to crack because it is heavier

Question 27:

A capacitor and a resistor are connected in series with each other and in series with an accumulator of negligible internal resistance. The potential across the terminals of the capacitor is

A Twice the e.m.f of the accumulator
B Less than the e.m.f by the potential drop across the resistor
C Zero
D The same as the e.m.f.
E Greater than

Question 28:

Which of the following statements is true? The frequency of a vibrating string is

A Proportional to its length
B Inversely proportional to the tension within it
C Proportional to the aptitude of vibration
D Inversely proportional to its cross-section
E Proportional to the square root of the tension within it

Question 29:

An air bubble rises from the bottom to the top of a water dam which is 40m deep. The volume of the bubble just below the surface is 2.5cm³. Find its volume at the bottom of the dam, if atmospheric pressure is equivalent to 10m water

A 0.0cm³
B 2.0cm³
C 1.6cm³
D 0.625cm³
E 0.5cm³

Question 30:

Which of the following electromagnetic waves has the shortest wavelength?

A Radio waves
B X-rays
C Infra-red
D Blue light
E Ultraviolet