Question: The focal length of a convex lens is
1. shorter for blue light than for red
2. the same for all colours
3. shorter for red light than for blue
4. maximum for yellow light
Answer: 1
Question: When a ball drops on to the floor it bounces. Why does it bounce?
1. The floor heats up on impact
2. Newton’s third law implies that for every action there is a reaction
3. File floor exerts a force on the ball during the impact
4. The floor is perfectly rigid
Answer: 2
Question: A body has a mass of 6 kg on the Earth; when measured on the Moon, its mass would be
1. nearly 1 kg
2. 6 kg
3. less than 1 kg
4. less than 6 kg
Answer: 2
Question: Transformer is a kind of appliance that can 1. increase power 2. increase voltage 3. decrease voltage 4. measure current and voltage Select the correct answer using the code given below:
1. 2 and 3 only
2. 1 and 4
3. 4 only
4. 2, 3 and 4
Answer: 1
Question: Which of the following is used for correcting myopic eyes?
1. Convex Lens
2. Concave Lens
3. Cylindrical Lens
4. None of the above
Answer: 2
Question: The sky appears blue due to-
1. Scattering of light
2. Reflection of light
3. Refraction of light
4. Diffraction of light
Answer: 1
Question: Decibel unit is used to measure-
1. Light intensity
2. Sound intensity
3. Magnitude of Earthquake
4. None of the above
Answer: 2
Question: What does an air conditioner installed in a room control?
1. Humidity and temperature only
2. Temperature only
3. Pressure and temperature only
4. Humidity, pressure and temperature
Answer: 1
Question: The minimum height of a plane mirror to see the full image of a person is equal to-
1. the height of the person
2. half the height of the person
3. one-fourth the height of the person
4. double the height of the person
Answer: 2
Question: Which one among the following will you put in to pure water in order to pass electric current through it?
1. Mustard oil
2. Sugar
3. Lemon Juice
4. Kerosene
Answer: 3
Question: In the case of nuclear disaster, which of the following options for cooling the nuclear reactors may be adopted?
1. Pumping of water to the reactors.
2. Use of boric acid.
3. Taking out the fuel rods and keeping them in a cooling pond.
Select the correct answer using the code given below:
1. 1 and 2 only
2. 1, 2 and 3
3. 1 and 3 only
4. 3 only
Answer: 1
Question: A close bottle containing water at room temperature is taken to the Moon and than the lid is opened. The water will
1. boil
2. freeze
3. decompose into oxygen and hydrogen
4. not change at all
Answer: 1
Question: The blackboard seems black because it
1. does not reflect any colour
2. reflects every colour
3. absorbs black colour
4. reflects black colour
Answer: 1
Question: A body is charged negatively. It implies that
1. it has lost some of its protons
2. it has lost some of its electrons
3. it has acquired some electrons from outside
4. None of these
Answer: 3
Question: A devastating Cloud Burst swept over Leh in August 2010. Which one of the following statements with regard to cloud Burst is not correct?
1. There is no satisfactory technique till now for predicting Cloud Burst
2. Cloud Burst is a localised weather phenomenon representing highly concentrated rainfall over a small area in a short duration of time
3. Cloud Burst occurs due to upward movement of moistureladen air with sufficient rapidity to form cumulonimbus clouds
4. Cloud Burst occurs only in hilly areas
Answer: 1