Question: A particle is moving freely. Then its
1. Kinetic energy is always greater than zero
2. Potential energy is greater than zero and kinetic energy is less than zero
3. Potential energy is less than zero and kinetic energy is greater than zero
4. Potential energy is zero and kinetic energy is less than zero
Answer: 1
Question: A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e., VI may be understood as
1. resistance R.
2. heat generated by the circuit
3. thermal power radiated by the circuit
4. rate of change of resistance
Answer: 2
Question: An object is placed at the focus of a concave mirror. The image will be
1. real, inverted, same size at the focus
2. real, upright, same size at the focus
3. virtual, inverted, highly enlarged
4. real, inverted, highly enlarged at infinity
Answer: 4
Question: Cream gets separated from milk when it is churned because of –
1. Gravitational force
2. Cohesive force
3. Centrifugal force
4. Frictional force
Answer: 3
Question: Speed of sound is maximum in
1. Solid
2. Liquid
3. Gas
4. Same in all cases
Answer: 1
Question: Newton is a unit of
1. Work
2. Energy
3. Force
4. Acceleration
Answer: 3
Question: Which principle states that when a body is partially or totally immersed in a fluid, it experiences an upward thrust equal to the weight of the fluid displaced by it –
1. Newton’s
2. Pascal’s
3. Archimedes’
4. Hooke’s
Answer: 3
Question: Which one among the following is not a chemical change?
1. Curdling of Milk
2. Ripening of fruit
3. Evaporation of water
4. Burning of coal
Answer: 3
Question: When a body falls from an aeroplane, there is increase in its
1. Mass
2. Acceleration
3. Potential energy
4. Kinetic energy
Answer: 4
Question: In a water lifting electric pump, we convert
1. Kinetic energy into Electrical energy
2. Kinetic energy into Potential energy
3. Electrical energy into Kinetic energy
4. Electrical energy into Potential energy
Answer: 3
Question: Which of the following radiations has the least wavelength?
1. α-rays
2. γ-rays
3. β-rays
4. X-rays
Answer: 2
Question: Alum used in various industrial processes especially dyeing contains, besides the sulphate of one univalent metal and water of crystallisation, the sulphate of a
1. Bivalent metal
2. Trivalent metal
3. Tetravalent metal
4. Pentavalent metal
Answer: 2
Question: Which is used as a magnifying glass?
1. Plane mirror
2. Concave mirror
3. Converging lens
4. Diverging lens
Answer: 3
Question: A uniform magnetic field is represents by –
1. Closed curves
2. Parallel Lines
3. Convergent lines
4. Divergent lines
Answer: 2