Find the increase in pressure required to decrease the volume of water sample by 0.01%. Bulk modulus of water = 2.1 × 109 Nm-2 .
4.3x 104 N/m2
1.8 × 107 N/m2
2.1 × 105 N/m2
3.7 × 104 N/m2
Figure shows spring + block + pulley system which are light. The time period of mass would be
C.
Let when m is hanging, the extension in the spring is l, then tension in the string is,
T1 = k l = mg
When force is applied, let the further extension is x.
The tension in the spring is
T2 = k ( x + l )
∴ Driving force = T2 - T1
= k ( x + l ) - kl
Driving force = k x
∴ Acceleration =
⇒ T =
=
⇒ T =
⇒ T =
The given p-V diagram shows gases during adiabatic process. Plots 1 and 2 should correspond respectively to
He and O2
O2 and He
He and Ar
O2 and N2
For an adiabatic expansion of a monoatomic perfect gas, the volume increases by 24%. What is the percentage decrease in pressure?
24%
40%
48%
71%
A slab consists of portions of different materials of same thickness and having the conductivities K1 and K2. The equivalent thermal conductivity of the slab is
K1 + K2
Two rigid boxes containing different ideal gases are placed on table. Box A contains one mole of nitrogen at temperature T0 , while box B contains 1 mole of helium at temperature 7/3 T0. The boxes are then put into thermal contact with each other and heat flows between them until the gases reach a common final temperature (ignore the heat capacity of boxes) then the final temperature of gases, Tf in terms of T0 is
The temperature of the cold junction of thermocouple is 0°C and the temperature of hot junction is To C. The emf is E = 16T - 0.04T2 µV. The inversion temperature Tf is
300o C
200o C
500o C
400o C
Two long straight wires, each carrying an electric current of 5 A, are kept parallel to each other at a separation of 2.5 cm. Find the magnitude of the magnetic force experiment by 10 cm of a wire.
4.0 × 10-4 N
3.5 × 10-6 N
2.0 × 10-5 N
2.0 × 10-9 N
A wire of resistance 10Ω is bent to form a complete circle. Find its resistance between two diametrically opposite point.
5 Ω
2.5 Ω
1.25 Ω
Ω
Find the resistance of a hollow cylindrical conductor of length 1.0 mm and 2.0 mm respectively. The resistivity of the material is 2.0 × 10-8 Ωm
2.1 × 10-3 Ω
1.3 × 10-4 Ω
3.2 × 10-4 Ω
4.6 × 10-2 Ω