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Q.11) Magnetism at the centre of a bar magnet is

(A) minimum

(B) maximum

(C) zero

(D) minimum or maximum

Q.12) Inside an aeroplane, flying at a high altitude

(A) the pressure is the same as that outside

(B) normal atmospheric pressure is maintained by the use of air pumps

(C) the pressure inside is less than the pressure outside

(D) normal humidity and partial vacuum are maintained

Q.13) It is more difficult to walk on a sandy road than on a concrete road because

(A) sand is soft and concreter is hard

(B) the friction between sand and feet is less than that between concrete and feet

(C) the friction between sand and feet is more than that between concrete and feet

(D) the sand is grainy but concrete is smooth

Q.14) Of the following properties of a wave, the one that is independent of the other is its

(A) amplitude

(B) velocity

(C) wavelength

(D) frequency

Q.15) Lux is the SI unit of

(A) intensity of illumination

(B) luminous efficiency

(C) luminous flux

(D) luminous intensity

Q.16) On a rainy day, small oil films on water show brilliant colours. This is due to

(A) dispersion

(B) interference

(C) diffraction

(D) polarization

Q.17) Materials for rain-proof coats and tents owe their water-proof properties to

(A) surface tension

(B) viscosity

(C) specific gravity

(D) elasticity

Q.18) RADAR is used for

(A) locating submerged submarines

(B) receiving a signals in a radio receiver

(C) locating geostationary satellites

(D) detecting and locating the position of objects such as aeroplanes

Q.19) Sound of frequency below 20 Hz is called

(A) audio sounds

(B) infrasonic

(C) ultrasonic

(D) supersonics

Q.20) On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

(A) mercury is a metal

(B) density of mercury is greater than that of water

(C) cohesion of mercury is greater than its adhesion with glass

(D) cohesion of water is greater than its adhesion with glass

ਜੇਕਰ ਤੁਸੀ ਕਿਸੇ ਵੀ ਸਰਕਾਰੀ ਨੌਕਰੀ ਬਾਰੇ ਜਾਣਕਾਰੀ ਲੈਣਾ ਚਾਹੁੰਦੇ ਹੋ ਤਾ ਉੱਤੇ ਦਿੱਤੇ ਕੰਮੈਟ ਬਾਕਸ ਵਿੱਚ ਕੰਮੈਟ ਕਰ ਸਕਦੇ ਹੋ ਧੰਨਵਾਦ ਅਰਨ ਮਨੀ ਜੋਬਜ ਟੀਮ