Question: Standing in front of a special mirror, a man finds his image small head and body but legs of actual size. The shapes of mirror parts are –
1. Concave and plane
2. Concave and convex
3. Convex and plane
4. Plane and convex
Answer: 1
Question: The ultimate source of energy in a hydroelectric power station is –
1. Solar energy
2. The potential energy of water
3. The kinetic energy of water
4. The electro-chemical energy of water
Answer: 1
Question: Which colour is in the centre of Rainbow?
1. Red
2. Yellow
3. Green
4. Violet
Answer: 3
Question: ________ is an instrument used to measure electric current.
1. Voltmeter
2. Galvanometer
3. Durometer
4. Dosimeter
Answer: 2
Question: What type of information system would be recognised by digital circuits?
1. Hexadecimal system
2. Binary system
3. Both hexadecimal and binary system
4. Only Roman system
Answer: 2
Question: Communication satellite are used to:
1. Transmit communication signal only
2. Receive communication signal only
3. Receive and redirect communication signal
4. Provide information of natural resources only
Answer: 3
Question: Steel is more elastic than rubber because it:
1. is harder than rubber
2. requires larger deforming force
3. is never deformed
4. is deformed very easily
Answer: 2
Question: ‘Farad’ is the unit of:
1. Conductance
2. Capacitance
3. Inductance
4. Resistance
Answer: 2
Question: The density of water 1g/cc. This is strictly valid at
1. 0°C
2. 4°C
3. 25°C
4. 100°C
Answer: 2
Question: In radio-communication, the signals emitted by transmitting antenna are reflected on
1. stratosphere
2. ozonosphere
3. ionosphere
4. troposphere
Answer: 3
Question: How does the Sun get its energy?
1. From gravitational pressure
2. From nuclear fission
3. From nuclear fusion
4. None of the above
Answer: 3
Question: Why are Polaroids used in sunglasses?
1. For the sake of fashion
2. To reduce the galre
3. To improve resolving powder of the eyes
4. None of the above
Answer: 2
Question: Optical fibres are hair-thin tubes of special glass and light can pass through them from end to end. Their special property is that light continues to travel through them even when they are bent. Which property of light underlies this phenomenon?
1. Total internal reflection
2. Refraction
3. Diffraction
4. Polarization
Answer: 1
Question: Food is cooked more quickly in pressure cooker, because –
1. The boiling point of water is lowered in it
2. The boiling point of water is raised in it
3. It absorbs heat quickly
4. It retains heat for a longer time
Answer: 2