Question: The velocity of sound is maximum in –
1. Vacuum
2. Metal
3. Liquid
4. Air
Answer: 2
Question: When you pull out the plug connected to an electrical appliance, you often observe a spark. To which property of the appliance, is this related?
1. Capacitance
2. Resistance
3. Inductance
4. Wattage
Answer: 1
Question: Which of the following is a physical change?
1. Boiling of Water
2. Rusting of Iron
3. Boiling of an Egg
4. Burning of Candle
Answer: 1
Question: In an atom no two electrons have all the four quantum numbers identical. This is known as
1. Paulis Exclusion principle
2. Hunds Rule
3. Aufbau Principle
4. Avogadros Law
Answer: 1
Question: In scuba-diving, while ascending towards the water surface, there is a danger of bursting the lungs. It is because of
1. Boyle’s law
2. Archimedes’ principle
3. Gay-Lussac’s law of combining volumes
4. Gram’s law of diffusion
Answer: 1
Question: Most of the communication satellites today are placed in a geostationary orbit. In order to stay over the same spot on the Earth, a geostationary satellite has to be directly above the
1. Equator
2. Tropic of Cancer
3. either North or South Pole
4. Tropic of Capricorn
Answer: 1
Question: Viewfinders, used in automobiles to locate the position of the vehicles behind, are made of
1. convex mirror
2. plane mirror
3. concave mirror
4. parabolic mirror
Answer: 1
Question: Why do you feel cool under a tree but not so under a tin shed on a sunny day?
1. The leaves give out water which vapourises absorbing some heat as latent heat
2. The greenness of the tree gives the cool feeling
3. Photosynthesis absorbs heat
4. The leaves convert water vapours into water which is a heat-absorbing process
Answer: 1