1
KCET 2021
MCQ (Single Correct Answer)
+1
-0

The source of electromagnetic wave can be a charge

A
moving with a constant velocity
B
moving in a circular orbit
C
at rest
D
moving parallel to the magnetic field
2
KCET 2020
MCQ (Single Correct Answer)
+1
-0

A light beam of intensity $$20 \mathrm{~W} / \mathrm{cm}^2$$ is incident normally on a perfectly reflecting surface of sides $$25 \mathrm{~cm} \times 15 \mathrm{~cm}$$. The momentum imparted to the surface by the light per second is

A
$$2 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$
B
$$1 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$
C
$$5 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$
D
$$1.2 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$
3
KCET 2019
MCQ (Single Correct Answer)
+1
-0

An antenna uses electromagnetic waves of frequency $$5 \mathrm{~MHz}$$. For proper working, the size of the antenna should be

A
15 m
B
300 m
C
15 km
D
3 km
4
KCET 2019
MCQ (Single Correct Answer)
+1
-0

Due to Doppler's effect the shift in wavelength observed is $$0.1 \mathop A\limits^o$$ for a star producing wavelength $$6000 \mathop A\limits^o$$. Velocity of recession of the star will be

A
25 km/s
B
10 km/s
C
5 km/s
D
20 km/s
KCET Subjects
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12