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## A train of mass 1600 kg attains a speed of 25 ms−1 in 20 seconds. The power developed in the engine is?

A. 2.5 KW B. 80 KW C. 25 KW D. 50 KW Correct Answer: Option D = 50 KW

## The mercury column in the barometer at notational atmospheric pressure has a height of?

A. 0.76 cm at see level B. 760 cm at sea level C. 7.6 cm at sea level D. 76 cm at sea level Correct Answer: Option D = 76 cm at sea level Explanation The height of the mercury column serves as an indicator of atmospheric pressure. At sea level and at a temperature of...

## A semiconductor is formed by?

A. co-ordinate bonds B. electrovalent bonds C. a substance-free of bonds D. covalent bonds Correct Answer: Option D = covalent bonds Explanation It’s generally created using silicon, germanium, or other pure elements. Semiconductors are created by adding...

## The main factor which affects the speed of sound wave is the?

A. properties of the medium B. amplitude of the sound wave C. intensity of the sound wave D. loudness of the sound wave Correct Answer: Option A = properties of the medium Explanation Factors Affecting The Speed of Sound The Density of Medium: Sound requires a medium...

## What quantity of heat is required to convert 20 g of ice at 0 ºC to water at the same temperature? (Specific latent heat of ice = 336 Jg−1)

A. 7.06 x 10³J B. 5.38 x 10³J C. 6.72 x 10³J D. 1.35 x 10³J Correct Answer: Option C = 6.72 x 10³J Explanation quantity of heat = mass * Specific latent heat → 20 * 336 quantity of heat = 6720j or 6.72 x...

## The graph of pressure (P) against the reciprocal of the volume (I/V) in Boyles’s law is a?

A. hyperbola B. parabola C. curve D. straight line Correct Answer: Option A – hyperbola Explanation The pressure (p) of a given quantity of gas varies inversely with its volume (v) at constant temperature; i.e., in equation form, pv = k, a constant. The graph of...

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