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Y

Yogesh • 7.43K Points
Tutor III Physics

41) Sound waves in air are

(A) transverse
(B) longitudinal
(C) electromagnetic
(D) polarised
Correct Answer - Option (B)

Explanation :
Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves. A vibrating string can create longitudinal waves as depicted in the animation below.

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Yogesh • 7.43K Points
Tutor III Physics

43) 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.
Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

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Y

Yogesh • 7.43K Points
Tutor III Physics

44) 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
Correct Answer - Option (A)

Explanation :
The amplitude (A) is independent of other means it is not related to the other quantities.

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Y

Yogesh • 7.43K Points
Tutor III Physics

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

(A) dispersion
(B) interference
(C) diffraction
(D) polarization
Correct Answer - Option (B)

Explanation :
On a rainy day, small oil films on water show brilliant colours. This is due to Interference. Interference is a phenomenon in which two waves superimpose to form a resultant wave of greater, lower or same amplitude.

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Y

Yogesh • 7.43K Points
Tutor III Physics

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

(A) surface tension
(B) viscosity
(C) specific gravity
(D) elasticity
Correct Answer - Option (A)

Explanation :
The material of rain proof coats have the property of not minimizing the surface tension which will tend the water molecule to be in its drop form.

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Y

Yogesh • 7.43K Points
Tutor III Physics

47) RADAR is used for:

(A) receiving a signals in a radio receiver.
(B) locating submerged submarines.
(C) locating geostationary satellites.
(D) detecting and locating the position of objects such as Aeroplanes.
Correct Answer - Option (D)

Explanation :
A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the objects. Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. Radio waves from the transmitter reflect off the object and return to the receiver, giving information about the object's location and speed.

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B

Brijesh Goswami • 9.45K Points
Tutor III English

48) Change the speech:
The sage said, "God helps those who help themselves."

(A) The sage said that God helps those who help themselves.
(B) The sage said that God helped those whose helped themselves.
(C) The sage said that God helps those who helped themselves.
(D) The sage said that God helped those who help themselves.
Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

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B

Brijesh Goswami • 9.45K Points
Tutor III English

49) Change the speech:
He said, "Where shall I be this time next year!"

(A) He asked that where should he be that time next year.
(B) He wondered where he should be that time the next year.
(C) He contemplated where shall he be that time the following year.
(D) He wondered where he would be that time the following year.
Correct Answer - Option (D)

No Explanation found. Add Explanation and get +2 points.

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