MCQ
Which of the following cannot travel in vacuum?
- ARadio waves
- BGamma Waves
- CInfrared Waves
- DInfrasonic waves
✓
Answer
- Infrasonic waves
Explanation:
Radio waves, gamma waves, and infrared waves are electromagnetic waves and due to this they do not need any material medium to travel and hence, can travel in vacuum. Whereas, infrasonic waves are mechanical waves and so, they need a material medium to travel. Therefore, infrasonic waves cannot travel in vacuum.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The capacitance of an air filled parallel plate capacitor is 10μμF . The separation between the plates is doubled and the space between the plates is then filled with wax giving the capacitance a new value of 40
. The dielectric constant of wax is
|
(a) 12.0 |
(b) 10.0 |
(c) 8.0 |
(d) 4.2 |
In terms of Rydberg's constant R, the wave number of the first Balmer line is
|
(a) R |
(b) 3R |
(c) |
(d) |
All of the following statements are correct except
|
(a) The magnification produced by a convex mirror is always less than one |
|
(b) A virtual, erect, same-sized image can be obtained using a plane mirror |
|
(c) A virtual, erect, magnified image can be formed using a concave mirror |
|
(d) A real, inverted, same-sized image can be formed using a convex mirror |
Monochromatic light is refracted from air into the glass of refractive index μ. The ratio of the wavelength of incident and refracted waves is
|
(a) 1 : μ |
(b) 1 : |
(c) μ : 1 |
(d) 1 : 1 |
In a cathode ray tube, what is the effect on the beam of particles if it passes through the electric field?
When light travels from glass to air, the incident angle is 
and the refracted angle is 
. The true relation is
|
(a) |
(b) |
(c) |
(d) Not predictable |
An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like
→Lenz's law is consequence of the law of conservation of
|
(a) Charge |
(b) Momentum |
(c) Mass |
(d) Energy |
Substances which have identical chemical properties but differ in atomic weight are called.
Two identical cycle wheels (geometrically) have different number of spokes connected from center to rim. One is having 20 spokes and the other having only 10 (the rim and the spokes are resistanceless). One resistance of value R is connected between center and rim. The current in R will be.