Q. Which one of the following statements best defines the concept of heat?
1) The transformation of energy from one form to another
2) The conversion of energy into mass and vice versa due to a temperature difference
3) The transfer of energy due to a temperature difference
4) The change in volume of a substance with temperature
Q. A point object is placed at the centre of curvature of a spherical concave mirror. Which one among the following would be the correct location of the image formed?
1) At infinity
2) At the centre of curvature
3) At the focal point
4) Between the focal point and the center of curvature
Q. The masses of two planets are in the ratio of 1:7. The ratio between their diameters is 2:1. The ratio of forces which they exert on each other is -
1) 1:7
2) 7:1
3) 1:1
4) 2:1
Q. A pumpkin weighs 7.5 N. On submerging it completely in water, 3/4L of water gets displaced. The acceleration due to gravity at the place where the pumpkin was weighed is 10 m/s2. Which one of the following is the correct value of the density of the pumpkin?
1) 10 kg / m3
2) 100 kg / m3
3) 1000 kg / m3
4) 10000 kg / m3
Q. An incandescent electric bulb converts 20% of its power consumption into light, and the remaining power is dissipated as heat. The bulb's filament has a resistance of 200 Ω, and 2 A current flows through it. If the bulb remains ON for 10 h and the rate of electricity charge is ₹ 5 /unit, then which among the following is the correct amount for the money spent on producing light?
1) ₹ 5
2) ₹ 6
3) ₹ 7
4) ₹ 8
Q. Lightning is due to -
1) The flow of charges bet¬ween different parts of the cloud.
2) The short-circuiting of charges between the upper and lower surfaces of the cloud.
3) The collection of positively charged particles on the base and the collection of negatively charged particles at the top of the cloud.
4) The induction of a positive charge on the ground below the negative charge at the base of the cloud.
Q. Which of the following statements gives characteristics of contact forces?
1. It appears between an object when it is in contact with some other object
2. It satisfies the third law of motion
3. It may appear between a pair of solid and fluid
Select the answer using the code given below:
1) Only 1 and 3
2) Only 2 and 3
3) Only 1 and 2
4) 1, 2, and 3
Q. An astronaut whose weight on Earth is 600 N experiences weightlessness on the International Space Station orbiting around the Earth. It means that -
1) The acceleration of the astronaut is zero
2) The normal reaction of the space station floor on the astronaut is zero
3) The gravitational pull of Earth on the astronaut is zero
4) The space station applies a centrifugal force on the astronaut
Q. Two resistances of 5.0 Ω and 7.0 Ω are connected in series, and the combination is connected in parallel with a resistance of 36.0 Ω. The equivalent resistance of the combination of three resistors is -
1) 24.0 Ω
2) 12.0 Ω
3) 9.0 Ω
4) 6.0 Ω
Q. The mass of 0.5 moles of N2 gas is -
1) 7 g
2) 14 g
3) 21 g
4) 28 g
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