The relationship between the coefficient of linear expansion \(\alpha\) and volumetric expansion (\(\gamma\)) is------

• A. \(\gamma\) = \(\alpha ^{-3}\)
• B. \(\gamma\) = \(\alpha\)
• C. 3\(\alpha\)
• D. \(\gamma\) = \(\alpha ^{3}\)

Two metals P and Q are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of their Length is 3: 4 respectively, the ratio of the increase in lengths of P to Q is

• A) 1:2
• B) 2:1
• C) 8:9
• D) 9:8

Which of the following statement(s) is/are correct about a fixed mass of gas compressed in an inexpansible container;

I. The average speed of the molecules increases

II. The temperature of the gas increases

III. The molecules hit the walls of the container more often than before the compression

• A. I only
• B. I and II only
• C. I, II, and III only
• D. I and III

Which of the following can be described as high tension transmission?

• A. High resistance and low voltage
• B. Low current and high voltage
• C. High current and low voltage
• D. High current and low resistance

In a hydraulic press, a force of 40N is applied to the smaller priston of area 10cm². If the area of the larger piston is 200cm², calculate the force obtained

• A. 800N
• B. 500N
• C. 80N`
• D. 50N

A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box. Calculate the velocity ratio of the machine

• A. 0.50
• B. 0.63
• C. 0.80
• D. 1.60

The wire of a platinum resistance thermometer has d resistance of 3.5\(\Omega\) at 0 °C and 10.52\(\Omega\) at 100°C. Calculate the temperature of the wire when its resistance is 7.5\(\Omega\).

• A.78 \(^o\)C
• B.25 \(^o\)C
• C.30\(^o\)C
• D.57 \(^o\)C

Consider the wave equation y = 5mm sin [1cm^-1x - 60s^-1t]. The wave number is?

• A. 0.1 cm^-1
• B. 10cm^-1
• C. 1.0cm^-1
• D. 2cm^-1

A hygrometer is an instrument used to measure

• A. Dew point
• B. Temperature
• C. Relative density
• D. Relative humidity

The diagram given illustrates two charged particles W and X. The charges on W and x are respectively

• A. negative; negative
• B. negative; positive
• C. positive; positive
• D. positive; negative