Q. Acids react with metal carbonates to liberate ____________ gas.
1) CO2
2) CO
3) H2
4) None of the above
Q. Some metal oxides react with acid as well as a base to produce salt and water. They are known as amphoteric oxides. Examples of amphoteric oxides are -
1) Al2O3 and ZnO
2) Al2O3 and CuO
3) CuO and ZnO
4) None of the above
Q. A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is -
1) krypton
2) kerosene
3) carbon steel
4) None of the above
Q. Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he/she is adjusting -
1) amplitude of sound
2) intensity of sound
3) frequency of the sitar string with the frequency of other musical instruments
4) None of the above
Q. A bus is moving along a straight path and takes a sharp turn to the right side suddenly. The passengers sitting in the bus will -
1) fall in the forward direction
2) bent towards the left side
3) bent towards the right side
4) None of the above
Q. Which of the following energy changes involves frictional force?
1) Potential energy to sound energy
2) Chemical energy to heat energy
3) Kinetic energy to heat energy
4) None of the above
Q. Centripetal force is responsible to -
1) keep the body moving along the circular path
2) fly the object along a straight line
3) the independent motion of the object in space
4) None of the above
Q. Which among the following is a positively charged particle emitted by a radioactive element?
1) Beta ray
2) Alpha ray
3) Cathode ray
4) None of the above
Q. A goalkeeper in a game of football pulls his hands backward after holding the ball shot at the goal. This enables the goalkeeper to -
1) exert a large force on the ball
2) increase the force exerted by the ball on the hands
3) decrease the rate of change of momentum
4) None of the above
Q. Ball bearings are used to convert static friction into -
1) drag
2) sliding friction
3) rolling friction
4) None of the above
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