1
NEET 2019
+4
-1
A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 $$\times$$ 10–2 N/m. The pressure inside the bubble equals at a point Z0 below the free surface of water in a container. Taking g = 10 m/s2, density of water = 103 kg/m3, the value of Z0 is :
A
1 cm
B
10 cm
C
100 cm
D
0.5 cm
2
NEET 2018
+4
-1
The power radiated by a black body is P and it radiates maximum energy at wavelength, $$\lambda$$0 . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength $${3 \over 4}{\lambda _0}$$, the power radiated by it becomes nP. The value of n is
A
$${3 \over 4}$$
B
$${4 \over 3}$$
C
$${{256} \over {81}}$$
D
$${{81} \over {256}}$$
3
NEET 2018
+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
4
NEET 2018
+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
EXAM MAP
Medical
NEET