Q1. Einstein got noble prize for which of the following?
(a) Theory of relativity
(b) Compton effect
(c) Photoelectric effect
(d) None of these
Q2. Why do two ice blocks join to form one block when pressed together?
(a) Melting point of ice increases with increase in pressure
(b) Melting point of ice is lowered with increase in pressure
(c) Melting point of ice remains unchanged with increase in pressure
(d) Melting point of ice is 0°C
Q3. When the distance between the object and the plane mirror increases—
(a) the image remains same
(b) the size of the image will become less than the size of the object
(c) the distance between the image and the plane mirror decreases
(d) the distance between the image and the plane mirror increases
Q4. Sound cannot travel though which of the following?
Q5. A dynamo which is said to generate electricity actually acts as a—
(a) Source of ions
(b) Converter of energy
(c) Source of electric charge
(d) Source of electrons
Q6. Which apparatus is used to measure the intensity of light?
(a) Lux meter
Q7. Of the two bulbs in a house, one glows brighter than the other. Which of the two has a large resistance?
(a) The bright bulb
(b) The dim bulb
(c) Both have the same resistance
(d) The brightness does not depend upon the resistance
Q8. L.P.G. is mostly liquefied–
Q9. Which of the following phenomenon is responsible for “sun is seen before the actual sun rise”?
(b) scattering of light
(d) rectilinear propagation of light
Q10. Why a long jumper runs before jumping?
(a) covers a greater distance
(b) gains momentum
(c) gains energy by running
(d) maintains conservation of momentum
Q11. Who discovered Photoelectric effect?
Q12. A jet engine works on the principle of conservation of –
(b) angular momentum
(c) linear momentum
Q13. A man with a dark skin, in comparison with a man with a white skin, will experience
(a) less heat and less cold
(b) more heat and less cold
(c) less heat and more cold
(d) more heat and more cold
Q14. Why electric iron uses wires of alloy?
(a) they do not oxidise at high temperatures
(b) they do not burn at high temperatures
(c) both (a) and (b)
(d) neither (a) nor (b)
Q15. For which one of the following is capillarity not the reason?
(a) Blotting of ink
(b) Spread a water drop on a cotton cloth
(c) Rising of underground water
(d) Rising of water from the roots of a plant to its foliage