Science Physics MCQ-138

General Science-Physics online Exam SSC, CivilsPrelims, NDA, RBI, UPPSC, CDS, DelhiPolice, UPSC Exams



Which of the following types is used by computed tomography employed for visualization of the internal structure of human body ?

 
 
 
 

Consider the following statements :
(i) a flute of smaller length produces waves of lower frequency
(ii) sound travels in rocks in the form of longitudinal elastic waves only.

Which of the statements given above is / are correct ?

 
 
 
 

Assertion (A): Radio waves bend in a magnetic field
Reason (R) : Radio waves are electromagnetic in nature Codes:

 
 
 
 

Pitch is sensation which depends upon

 
 
 
 

When light waves pass from air to glass, the variables affected are

 
 
 
 

Consider the following statements
(i) light of longer wavelength is scattered much more than the light of shorter wavelength
(ii) The speed of visible light in water is 95 times the speed in vacuum
(iii) Radio waves are produced by rapidly oscillating electrical currents
(iv) To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves.

Which of these statements are correct ?

 
 
 
 

Which one of the following types of glass can cut of ultraviolet rays ?

 
 
 
 

Consider the following statements.

(i) X-rays show transverse wave characteristics
(ii) X-rays can eject electrons from certain metal Surfaces
(iii) X-rays of 1 A are harder than X – rays of 2 A.

Which of the statements given above is / are correct ?

 
 
 
 

Why is sound heard with more intensity through CO2 than through the air ?

 
 
 
 

If V1, V2 and V3 are the velocities of sound in steel, water and vacuum respectively, which one of the following relations is correct ?

 
 
 
 

A string 1m long is drawn by a vibrator attached to its end. The string vibrates in three segments. If the frequency of vibration of the vibrator is 480 Hz, then what is the speed of waves through the string ?

 
 
 
 

Match List-I (type of electromagnetic radiation) with List-II (corresponding wavelength) and select the correct answer using the code given below

List-I

(A) Radio waves
(B) Ultraviolet waves
(C) Visible light
(D) X-rays

List-II

1 .4×10-7-7×10-7m
2 .10-11-10-9 m
3 .10-6 – 10-3 m
4 .10-3 – 10-5 m
5 .10-9 – 10-7 m
Code:

A B C D

 
 
 
 

Consider the following statements with reference to X-rays
(1) They produce heat when absorbed by matter
(2) They are generated when fast moving electrons strike a metal target
(3) They can penetrate through a thin sheet of aluminum.
Which of the statements given above are correct ?

 
 
 
 

What is the frequency of a wave whose time-period is 05 second ?

 
 
 
 

Consider the following statements

(1) Sound waves are elastic waves
(2) In sound waves, the vibrations are perpendicular to the direction in which the wave travels.

Which of these statement is / are correct ?

 
 
 
 

The velocity of sound produced by a vibrating body varies –

 
 
 
 

A particle is executing simple harmonic motion. Its total energy is proportional to its-

 
 
 
 

A wave under goes reflection from a rigid boundary. One of its characteristic parameters that changes is

 
 
 
 

X-rays are used for the study of crystal structure because

 
 
 
 

The quality of a musical note depends upon

 
 
 
 

The velocities of sound in air and water are 336 m/sec and 1470 m/sec respectively. Two sources producing waves of wavelength 6 m and 7 m sounded together will produce beats

 
 
 
 

The audible frequency range of a human ear is

 
 
 
 

The wavelength of X-rays is of the order of

 
 
 
 

In vacuum, the speed of light

 
 
 
 

Consider the following parts of spectra

(1) visible
(2) infrared
(3) ultraviolet
(4) microwave

Which one of the following is the correct sequence in which their wavelength in crease ?