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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
- frequency
- tension in the string
- wavelength
- linear density of the string
(a) 1 and 2
(b) 1 only
(c) 3 and 4
(d) 1, 2, 3 and 4
The correct answers to the above question in:
Answer: (b)
Sound waves cannot travel is vacuum.
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Consider the following statements : Sound waves can undergo
- reflection
- refraction
- interference
a) 2 and 3 only
b) 1 and 2 only
c) 1 and 3 only
d) 1, 2 and 3
Answer »Answer: (d)
Question : 2
Assertion (A):
The danger signal is made up of red colour.
Reason (R):
Red colour is scattered the least.
Select the correct answer using the codes given below.
a) (A) is true, but (R) is false
b) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
c) Both (A) and (R) are true and (R) is the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (c)
Question : 3
The colour of an opaque object is due to the colour it
a) Reflects
b) Refracts
c) Absorbs
d) Scatters
Answer »Answer: (a)
Question : 4
Consider the following statements.
- The heart vibrates at infrasonic.
- The speed of sound is more in gas than in liquid and solid.
- Mach number is used to describe the speed of sound.
- Ultrasonic sound has frequency more than 20,000 Hz.
a) 2, 3 and 4 are correct
b) 1, 3 and 4 are correct
c) 1, 2 and 3 are correct
d) 1, 2 and 4 are correct
Answer »Answer: (b)
Question : 5
Consider telecommunication through optical fibres. Which of the following statement is not true?
a) Optical fibres are subject to electromagnetic interference from outside
b) Optical fibres can be of graded refractive index
c) Optical fibres have extremely low transmission loss
d) Optical fibres may have homogeneous core with a suitable cladding
Answer »Answer: (a)
Question : 6
The body temperature of a healthy man is
a) 37° Fahrenheit
b) 98.4° Celsius
c) 37° Celsius
d) 98.4° Kelvin
Answer »Answer: (c)
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