1
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by $$\Delta $$l on applying a force F, how much force is needed to stretch the second wire by the same amount?
A
6F
B
F
C
9F
D
4F
2
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
3
NEET 2017
MCQ (Single Correct Answer)
+4
-1
The bulk modulus of a spherical object is 'B'. If it is subjected to uniform pressure 'P', the fractional decrease in radius is
A
$${B \over {3p}}$$
B
$${{3p} \over B}$$
C
$${p \over {3B}}$$
D
$${p \over B}$$
4
NEET 2017
MCQ (Single Correct Answer)
+4
-1
A U tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil is

NEET 2017 Physics - Properties of Matter Question 73 English
A
425 kg m$$-$$3
B
800 kg m$$-$$3
C
928 kg m$$-$$3
D
650 kg m$$-$$3
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