Question: A person climbing a hill bends forward in order to –
1. Avoid slipping
2. Increase speed
3. Reduce fatigue
4. Increase stability
Answer: 4
Question: Conservation of energy means that –
1. Energy can be created as well as destroyed
2. Energy can be created, but not destroyed
3. Energy cannot be created, but can be destroyed
4. Energy can neither be created nor destroyed
Answer: 4
Question: A sheet of paper can be pulled out quickly from under a glass of water without spilling the water. This phenomenon illustrates –
1. Lack of friction between paper and glass
2. Newton’s third law of motion
3. Inertia
4. Acceleration
Answer: 3
Question: On finds it more difficult to walk on ice than on a concrete road because –
1. Ice is soft and spongy where as concrete is hard
2. the friction between the ice and the feet is less than that between the concrete and the feet
3. There is more friction on ice than on concrete
4. None of the above
Answer: 2
Question: A person weighs more in a lift, which is –
1. Moving up with a constant velocity
2. Moving down with a constant velocity
3. Accelerating upward
4. Accelerating downward
Answer: 3
Question: A device used for converting A. C. into D. C. is called –
1. Transformer
2. Rectifier
3. Induction coil
4. Dynamo
Answer: 2
Question: Which of the following are Einstein’s discoveries?
1. Photoelectric affect and X-rays
2. Radioactivity and the theory of relativity
3. Photoelectric effect and the theory of relativity
4. Radioactivity and X-rays
Answer: 3
Question: The age of the earth can be estimated by –
1. Uranium dating
2. Carbon dating
3. Atomic clocks
4. Biological clocks
Answer: 1
Question: An electric bulb has a filament made of –
1. Copper
2. Iron
3. Lead
4. Tungsten
Answer: 4
Question: Which of the following devices converts electrical energy into mechanical energy?
1. Dynamo
2. Transformer
3. Electric motor
4. Inductor
Answer: 3
Question: The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?
1. Ice is a bad conductor of heat
2. Since the surface of the lake is at the same temperature as the air, no heat is lost
3. The density of water is maximum at 4°C
4. None of the above
Answer: 3
Question: Steel is more elastic than rubber because it –
1. is harder than rubber
2. requires larger deforming force
3. is never deformed
4. is deformed very easily
Answer: 2
Question: ‘Farad’ is the unit of –
1. Conductance
2. Capacitance
3. Inductance
4. Resistance
Answer: 2
Question: Among the material listed below sound travels the fastest in
1. Hydrogen
2. Vacuum
3. Steel
4. Water
Answer: 3
Question: Combustion is the process in which
1. Only heat is produced
2. Heat and light are produced
3. No heat is produced
4. No light is produced
Answer: 2