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1. Detergents dissolved in water help in cleaning clothes by?
(A) Increasing the temperature of the water
(B) Reacting chemically with dirt
(C) Reducing the surface tension by water
(D) Dissolving dirt
2. A remote control gadget has in it?
(A) A small electromagnet, which emits electromagnetic waves
(B) A small oscillator that emits electric pulses
(C) A small transmitter that emits infrared signals
(D) None of the above
3. In storms, the roofs of some houses are carried away. This is in accordance with?
(A) Bernoulli’s principle
(B) Archimedes’ principle
(C) Law of inertia
(D) Pascal’s law
4. In Newton’s third law, the action and reaction forces
1. act on different bodies
2. act on the same body
3. are not always equal
4.are always equal
Choose the correct answer from the below-given codes?
(A) 1 and 3
(B) 1 and 4
(C) 2 and 4
(D) 2 and 3
5. The phenomenon of mirage is due to?
(A) Increased absorption of light by air at higher temperature
(B) Change in refractive index of air with change in temperature
(C) Total internal reflection
(D) Decreased absorption of light by air at higher temperature
6. Which law is involved in the act of cleaning a carpet by beating it with a stick?
(A) First law of motion
(B) Second law of motion
(C) Law of conservation of energy
(D) Law of conservation of mass
7. Lightning is formed when?
(A) Similar charges of electricity rush toward each other and then get repelled
(B) Clouds strike against impurities in air and the friction burns up these impurities
(C) Strong opposite charges in different clouds break down the resistance offered by the intervening air
(D) Water vapor produces electricity in the clouds
8. Match the following?
|List – I||List – II|
|A. Voltmeter||1. Measurement of potential difference|
|B. Ammeter||2. Measurement of electric current|
|C. Velocity of light||3. Measurement of emf|
|D. Potentiometer||4. Detection of electric current|
(A) 1, 2, 3, 4
(B) 4, 3, 1, 2
(C) 1, 2, 4, 3
(D) 3, 4, 2, 1
9. Remote sensing satellites are called polar satellites because?
(A) They orbit the earth along the poles or from pole to pole
(B) They are fixed at a point
(C) The axis of satellite is always pointed towards the pole
(D) None of the above
10. Then terms hydroponics is used to describe?
(A) Sound propagation under water
(B) Cultivation of plants in water
(C) A disease in which patient develops fear of water
(D) Study of electronic device which work under water