Welcome to you Physics - Section 3

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1. Magnetism at the centre of a bar magnet is

A) minimum

B) maximum

C) zero

D) minimum or maximum

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2. 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

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3. Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2

A) 0.14 m/s

B) 140 m/s

C) 1.4 km/s

D) 14 m/s

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4. 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

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5. Lux is the SI unit of

A) intensity of illumination

B) luminous efficiency

C) luminous flux

D) Force and rate of change of linear momentum

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

A) dispersion

B) interference

C) diffraction

D) polarization

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7. Point A is at a lower electrical potential than point B. An electron between them on the line joining them will

A) move towards A

B) move towards B

C) move at right angles to the line joining A and B

D) remain at rest

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8. Materials for rain-proof coats and tents owe their water-proof properties to

A) surface tension

B) viscosity

C) specific gravity

D) elasticity

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9. 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

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10. Sound of frequency below 20 Hz is called

A) audio sounds

B) infrasonic

C) ultrasonic

D) supersonics

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