A motorcar is moving with uniform velocity on a rough horizontal road. According to Newton’s law of motion_____.

1. 1. the car is being accelerated
   2. Forces are acting on the car
   3. The kinetic energy of the car is increasing
   4. There is no unbalanced force acting on the car

Colours seen on oil films spread on water are seen because of _____.

1. 1. Reflection of light
   2. Refraction of light
   3. Interference of light waves
   4. None of these

What is the melting point of tungsten?

1. 1. 3000°C
   2. 500°C
   3. 2500°C
   4. 1000°C

The lightning conductor or rod used for protecting buildings from lightning is made of _____.

1. 1. Iron
   2. Aluminum
   3. A red light filter
   4. Copper

Which of the following instruments is used for detecting and measured small electric currents?

1. 1. Voltmeter
   2. Galvanometer
   3. Ammeter
   4. Fluxmeter

Through which of the following media does sound travel the fastest?

1. 1. Cold water
   2. Warm air
   3. Steel
   4. Cool air

A fresh egg sinks in pure water, whereas it floats in saturated salty water. This is due to

1. 1. Higher density of the salty water
   2. the fluid matter inside the egg-shell
   3. the fact that the egg-shell is made of calcium which is heavier than pure water
   4. Higher density of the pure water

A mixture of which of the following gases is used in the manufacture of electric bulbs?

1. 1. Nitrogen and Oxygen
   2. Oxygen and Argon
   3. Oxygen and Hydrogen
   4. Nitrogen and Argon

Why are transformer used in the transmission of electric power?

1. 1. Because they can conserve electrical energy
   2. Because they help to distribute electrical energy efficiently
   3. Because they speed up transmission
   4. because they can reduce transmission losses

a magnet freely suspended by means of a string will always set itself in which of the directions?

1. 1. For guarding the instruments against unauthorized handling
   2. For protection against the effect of external magnetic fields
   3. For absorbing heat generated during the functioning of the instrument
   4. For protection against the effect of moisture in the air