Question: There are four statements gives below explaining why mercury is chosen as a thermometric liquid. which of these statements is wrong?
1. Volume of mercury increases equally for equal rises of temperature
2. Mercury is a good conductor of heat
3. Mercury does not stick to glass
4. Mercury has a large specific heat
Answer: 1
Question: The internal energy of a body means –
1. Sum total of its kinetic and potential energy of its constituent molecules.
2. its kinetic energy
3. Total kinetic energy of its constituent moleules
4. Sum total of its kinetic and potential energy
Answer: 1
Question: Which of the following is a dimensionless quantity?
1. Acceleration
2. Volume
3. Refractive Index
4. Kinetic energy
Answer: 3
Question: Four wires of same material and different dimensions are stretched under the equal weight, which one will suffer greater elongation? The dimensions are given below –
1. Length 100 cm, diameter 1 mm
2. Length 200 cm, diameter 2 mm
3. Length 300 cm, diameter 3 mm
4. Length 400 cm, diameter 0.5 mm
Answer: 4
Question: Water is used in hot water bags because
1. it is easily obtained
2. it has high specific heat
3. it is cheaper and is not harmful
4. it is easy to heat water
Answer: 2
Question: Water drops cannot stick to the oily surface due to
1. surface tension
2. lack of adhesive force
3. water is lighter than oil
4. cannot mix each other
Answer: 2
Question: Energy in reflected light
1. does not depends on the angle of incidence
2. decreases with the increase in angle of incidence
3. increases with the increase in angle of incidence
4. becomes maximum for angle of incidence equal to 45 degree
Answer: 1
Question: The unit of power is called –
1. Watt
2. Dyne
3. Erg
4. Ohm
Answer: 1
Question: The sound produced by a bat is –
1. Ultrasonic
2. Infrasonic
3. Audible
4. Subsonic
Answer: 1
Question: When a bar magnet is cut into two equal halves, the pole strength of each piece –
1. Becomes zero
2. Remains the same
3. Becomes Half
4. Becomes Double
Answer: 2
Question: In a refrigerator, cooling is produced by
1. the evaporation of a volatile liquid
2. the sudden expansion of a compressed gas
3. the ice which deposits on the freezer
4. None of the above
Answer: 1
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 fluid displaced by it:
1. Archimedes’
2. Hooke’s
3. Pascal’s
4. Newton’s
Answer: 1