1
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
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 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
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 80 English
A
425 kg m$$-$$3
B
800 kg m$$-$$3
C
928 kg m$$-$$3
D
650 kg m$$-$$3
3
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
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
Change Language
A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be
A
450
B
1000
C
1800
D
225

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