Q1. Which zone of a candle flame is the hottest?
(a) Dark innermost zone
(b) Outermost zone
(c) Middle luminous zone
(d) Central zone
Q2. Pyrometer is used to measure—
(a) air pressure
(b) humidity
(c) high temperature
(d) intensity of earthquake
Q3. What is the source of electrical energy in an artificial satellite?
(a) Solar cell
(b) Mini nuclear reactor
(c) Dynamo
(d) Thermopile
Q4. The image of the object that we see forms on the retina of our eyes is—
(a) always erect
(b) always inverted
(c) erect or inverted depends upon the intensity of light
(d) erect or inverted depends upon the age of the person
Q5. Bats can ascertain distance, directions, nature and size of the obstacles at night. This is possible by reflection of the emitted—
(a) ultrasonic waves from the bat
(b) ultrasonic waves from the distant objects
(c) supersonic waves from the bat
(d) supersonic waves from the distant objects
Q6. If the doors of a refrigerator are left open for a few hours, the room temperature will—
(a) decrease
(b) increase
(c) remain the same
(d) decrease only in the area in the vicinity of the refrigerator
Q7. Sodium vapour lamp is usually used in street light, because
(a) it is cheap
(b) light from this is monochromatic and will not split through water droplets
(c) it is pleasing to the eyes
(d) it is brightly illuminating
Q8. The magnetic needle always points in _______ direction.
(a) East – West
(b) West – South
(c) North – South
(d) North – East
Q9. A myopic eye can be corrected by using a—
(a) convex lens
(b) concave lens
(c) cylindrical lens
(d) plano convex lens
Q10. A cut diamond sparkles because of its—
(a) hardness
(b) high refractive index
(c) emission of light by the diamond
(d) absorption of light by the diamond
Q11. When a body is stationary, then
(a) there is no force acting on it
(b) the body is in vacuum
(c) the force acting on it is not in contact with it
(d) the net forces acting on it balances each other
Q12. Evening Sun is not as hot as the midday sun. What is the reason?
(a) In the evening, radiation travel slowly
(b) In the evening, the temperature of the sun decreases
(c) Ozone in atmosphere absorbs more light in the evening
(d) In the evening, radiations travels larger distance through atmosphere
Q13. Air is filled in vehicle tyres because
(a) it is non-conducting
(b) it is cheap
(c) it has low density
(d) it is highly compressible
Q14. The magnet is strongest near the
(a) poles of the magnet
(b) ends of the magnet
(c) centre of magnet
(d) on equator point from the poles of the magnet
Q15. Noise and music differ in their
(a) quality
(b) tone
(c) note
(d) pitch
