## Thursday, February 27, 2020 # Physics mcq For UPSC | SSC | Rail | RRB | State PSC P17

Page 17

1485161. Which of the following not a unit of length?
A
AU
B
C
Light year
D
Micron.
B
Explanation: A radian is a unit of measurement for angles defined by the ratio of the length of the arc of a circle to the radius of that circle. One radian equals 180 degrees.
2556162. Which is not a primary colour from the followings?
A
black
B
Green
C
red
D
blue
A
1503163. A piece of stone tied to a string is being rotated in a vertical plane with constant angular velocity. The tension of the string will be maximum when
A
The string is horizontal
B
The tension is always the same
C
The stone is in the highest position
D
The stone is in the lowest position.
D
Correct Answer: D. The stone is in the lowest position.
1552164. X-rays are
A
beams of electrons
B
visible to the naked eye
C
electromagnetic radiations of very short wavelength
D
electromagnetic radiations of very long wavelength
C
1604165. Astronomy means the study of the
A
Sky
B
Sun
C
Moon
D
Stars
D
1463166. Which one will you correct myopic vision?
A
A convex lens of proper power
B
Convex spectacle lens of suitable length
C
A concave lens of suitable focal length
D
Sphero-cylindrical lens.
C
Correct Answer: C. A concave lens of suitable focal length
1567167. Water rises up a capillary tube because of
A
Viscosity
B
it's density
C
Elasticity
D
Surface tension
D
1557168. The production of shadow proves that
A
Light is a type of particle.
B
Light does not diffract
C
Light travels approximately is straight lines.
D
Light is an electromagnetic wave
C
Correct Answer: C. Light travels approximately is straight lines.
1535169. Weight of a man is more
A
At the center of the earth
B
In space
C
On the equator
D
At poles
D
1541170. A compound microscope has
A
used to view only dead organisms.
B
requires large room space.
C
two lenses
D
requires a UV light source
C