Physics - Section 1 (7)

Directions to Solve

Physics - Section 1

49.

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

Answer: Option C

Explanation:

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50.

Sound of frequency below 20 Hz is called

A.	audio sounds
B.	infrasonic
C.	ultrasonic
D.	supersonics

Answer: Option B

Explanation:

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51.

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

Answer: Option D

Explanation:

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52.

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

A.	surface tension
B.	viscosity
C.	specific gravity
D.	elasticity

Answer: Option A

Explanation:

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53.

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

Answer: Option B

Explanation:

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54.

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

A.	dispersion
B.	interference
C.	diffraction
D.	polarization

Answer: Option B

Explanation:

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55.

Lux is the SI unit of

A.	intensity of illumination
B.	luminous efficiency
C.	luminous flux
D.	luminous intensity

Answer: Option A

Explanation:

The SI unit of intensity of illumination (illuminance) is the lux. An illuminance of 1.0 lux is produced by 1.0 lumen of light shining on an area of 1.0 m^2.

56.

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

Answer: Option A

Explanation:

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Physics - Section 1 (7)

Physics - Section 1

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