The resistance of a bulb rated 60 watts/220 volts is approximately_____.

1. 1. 800 Ω
   2. 40 Ω
   3. 400 Ω
   4. 4 Ω

Why is the light of ordinary lamp hotter than the tubelight?

1. 1. It has more surface for distribution of energy
   2. It due to ionization of gases
   3. It is due to incandescence
   4. It gives white light

In an electronic watch, the component corresponding to the pendulum of pendulum clock is_____.

1. 1. Crystal oscillator
   2. Diode
   3. Transistor
   4. Balance wheel

If a bimetallic strip is heated, it will_____.

1. 1. Not bend al all
   2. bend towards the metal with lower thermal expansion coefficient
   3. Twist itself into a helix
   4. Bend towards the metal with higher thermal coefficient of expansion

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