1
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
A small sphere of radius ‘r’ falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to
A
r3
B
r2
C
r5
D
r4
2
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct?
A
Raindrops will fall faster.
B
Walking on the ground would become more difficult.
C
Time period of a simple pendulum on the Earth would decrease.
D
g on the Earth will not change.
3
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is
A
13.2 cm
B
8 cm
C
12.5 cm
D
16 cm
4
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is 20 m s–2 at a distance of 5 m from the mean position. The time period of oscillation is
A
2$$\pi $$ s
B
$$\pi $$ s
C
2 s
D
1 s
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