Question: Transistors used in electronic equipments are mostly made of
1. Silver
2. Copper
3. Silicon
4. Carbon
Answer: 3
Question: Which of the following is a unit of angle measurement?
1. Hour
2. Second
3. Millimeter
4. None of these
Answer: 2
Question: Find the incorrect one
1. Hertz is used to measure frequency.
2. Kelvin is used to measure temperature.
3. Bel is used to measure atmospheric pressure.
4. ohm is used to measure electrical resistance.
Answer: 3
Question: If the radius of the earth were to shrink by 1 %, its mass remaining the same, the value of ‘g’ on the earth’s surface would
1. increase by 0.5%
2. increase by 2%
3. decrease by 0.5%
4. decrease by 2%
Answer: 2
Question: Which of the statements is NOT correct?
1. The velocity of sound in air increases with the increase of temperature
2. The velocity of sound in air is independent of pressure
3. The velocity of sound in air decreased as humidity increases
4. The velocity of sound in air is not affected by the change in amplitude and frequency
Answer: 3
Question: Diffusion of light in the atmosphere takes place due to
1. Carbon dioxide
2. Dust particles
3. Helium
4. Water vapours
Answer: 2
Question: Consider the following statements: A 4-wheel vehicle moving a sharp circular path at high speed will 1. Overturn about its outer wheels 2. Overturn about its inner wheels 3. Skid outwards 4. Skid inwards Which of these statements are correct?
1. 1 & 3
2. 2 & 4
3. 2 & 3
4. 1 & 4
Answer: 3
Question: The power of lens is – 2D. What is its focal length?
1. 2m
2. 0.5m
3. 1.0m
4. 0.5m
Answer: 4
Question: X-rays comprise of:
1. Electrons only
2. Protons only
3. Neutrons only
4. Electromagnetic radiations
Answer: 4
Question: Which one of the following is a vector?
1. Kinetic energy
2. Pressure
3. Rate of change of momentum
4. Density
Answer: 3
Question: Which one of the following allotropes of carbon is used for cutting and drilling?
1. Diamond
2. Graphite
3. Activated carbon
4. Carbon black
Answer: 1
Question: Which of the following is used in semi-conductors?
1. Aluminium
2. Copper
3. Silicon
4. None of these
Answer: 3
Question: The blue colour of the clear sky is due to –
1. Diffraction of light
2. Dispersion of light
3. Reflection of light
4. Refraction of light
Answer: 2
Question: In amplitude modulation –
1. Amplitude of the carrier is kept constant
2. Change occurs in carrier frequency
3. Amplitude is varied according to the instaneous value of modelling wave
4. None of these
Answer: 3