Q. Which one of the following statements about the Industrial Revolution is correct?
1) Thomas Savery invented astrolabe
2) Thomas Newcomen invented chemical dyes
3) James Watt's invention converted the steam engine from being a mere pump into one that would provide energy to power machines in factories
4) Mathew Boulton discovered the technique of refining gold of impurities
Q. There is a ball of mass 320 g. It has 625 J of potential energy when released freely from a height. The speed with which it will hit the ground is -
1) 62.5 m/s
2) 2.0 m/s
3) 50 m/s
4) 40 m/s
Q. A car weighs 1000 kg. It is moving with a uniform velocity of 72 km/h towards a straight road. The driver suddenly presses the brakes. The car stops in 0.2s. The retarding force applied on the car to stop it is -
1) 100 N
2) 1000 N
3) 10 kN
4) 100 kN
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. Organisms of which of the following phylum are called sponges?
1) Coelenterata
2) Platyhelminthes
3) Porifera
4) Echinodermata
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. Which one among the following is correct for a person suffering from myopia?
1) The person can see near objects clearly
2) The person can see distant objects clearly
3) The person cannot distinguish colours
4) The person can neither see near objects nor distant objects clearly
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
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