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6. Planets are
(A). luminous bodies which twinkle
(B). non - luminous bodies which twinkle
(C). luminous bodies which don't twinkle
(D). non - luminous bodies which don't twinkle


7. If you move towards a mirror at the speed of 10 cm/s, then your image will approach you at the speed of
(A). 5 cm/s
(B). 10 cm/s
(C). 20 cm/s
(D). Data inadequate


8. In outer space a spaceman
(A). cannot see stars during day time
(B). cannot see stars at all
(C). can see stars during day - time opposite sun
(D). can see stars during day time in all directions


9. The soap bubbles look coloured when viewed in white light due to
(A). scattering of light by thin layer
(B). interference of light by thin layer
(C). trasmission of light
(D). characteristics of the colours of soap - solution


10. Which of the following devices changes the electrical energy into mechanical energy?
(A). Dynamo
(B). Electric motor
(C). Inductor
(D). Rectifier