Multiple Choice QuestionsThe change in the value of g at a height ‘h’ above the surface of the earth is the same as at a depth ‘d’ below the surface of earth. When both ‘d’ and ‘h’ are much smaller than the radius of earth, then which one of the following is correct?
d =h/2
d=3h/2
d =2h
d =2h
A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work to be done against the gravitational force between
(you may take G = 6 . 67× 10-11 Nm2/ kg2)
13.34 x 10-10 J
3.33 x 10-10 J
6.67 x10-9 J
6.67 x10-9 J
A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator the length of water column in the capillary tube will be
8 cm
10 cm
4 cm
4 cm
If S is stress and Y is Young’s modulus of material of a wire, the energy stored in the wire per unit volume is
2S2Y
S2/2Y
2Y/S2
2Y/S2
Which of the following is incorrect regarding the first law of thermodynamics?
It introduces the concept of internal energy
It introduces the concept of entropy
It is not applicable of any cyclic process
It is not applicable of any cyclic process
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is
1/2
1/4
1/3
1/3
The figure shows a system of two concentric spheres of radii r1 and r2 and kept at temperatures T1 and T2 respectively. The radial rate of flow of heat in a substance between the two concentric sphere is proportional to
A system goes from A to B via two processes I and II as shown in the figure. If ∆U1 and ∆U2 are the changes in internal energies in the processes I and II respectively, the
∆U1 = ∆U2
relation between ∆U1 and ∆U2 can not be determined
∆U2 > ∆U1
∆U2 > ∆U1
The function sin2(ωt) represents
a periodic, but not simple harmonic motion with a period 2π/ω
a periodic, but not simple harmonic motion with a period π/ω
a simple harmonic motion with a period 2π/ω
a simple harmonic motion with a period 2π/ω
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