1
NEET 2018
MCQ (Single Correct Answer)
+4
-1
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
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
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
A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27°C two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27°C is
A
330 m s–1
B
339 m s–1
C
350 m s–1
D
300 m s–1
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