Physics Past Questions and Answers

Whenever light waves are restricted to a specific plane they are said to be

A Diffracted
B Refracted
C Diffused
D Regularly reflected
E Plane polarized

Question 552:

A solid material of volume 100\(cm^{-3}\) is heated through a temperature difference of 40°C. Calculate the increase in the volume of the material if its linear expansitivity is 2 x \(10^{-6}K{-1}\)

A 2.4 x\(10^{-2}cm^{-3}\)
B 1.6 x\(10^{-2}cm^{-3}\)
C 8 x\(10^{-2}cm^{-3}\)
D 5 x\(10^{-2}cm^{-3}\)
E 4 x\(10^{-2}cm^{-3}\)

Question 553:

Calculate the quantity of heat released when 100g of steam at 100°C condenses to water(Take the specific latent heat of vaporization of water as 2.3x \(10^6Jkg^{-1}\))

A 2.3x\(10^{1}J\)
B 2.3x\(10^{2}J\)
C 2.3x\(10^{4}J\)
D 2.3x\(10^{5}J\)
E 3.3x\(10^{7}J\)

Question 554:

A fixed mass of gas occupies a volume of 20\(cm^3\) at a fixed pressure of 700mmHg. Assuming that the temperature remains constant, what will be the volume of the gas at 750mmHg?

A 2.5\(cm^3\)
B 15.5\(cm^3\)
C 18.7\(cm^3\)
D 21.4\(cm^3\)
E 72.5\(cm^3\)

Question 555:

A converging lens of focal length 15cm is used to obtain a real image magnified \(1\frac{1}{2}\) times. Calculate the distance of the image from the lens?

A 37.5cm
B 22.5cm
C 15cm
D 7.5cm
E 3.3cm