1 g of steam is sent into 1 g of ice. At thermal equilibrium, the resultant temperature of mixture is
270oC
230oC
100oC
120oC
The molar specific heats of an ideal gas at constant pressure and volume are denoted by CP and CV respectively. If and R is then CV universal gas constant, then CV is equal to
γR
D.
Using
CP CV = R
Where CP is specific heat in constant pressure
CV is specific heat in constant volume
R is universal gas constant
⇒ CV = R
⇒ ( γ 1) =
⇒ CV =
Assertion: Water kept in an open vessel will quickly evaporate on the surface of the moon.
Reason: The temperature at the surface of the moon is much higher than the boiling point of water.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: A undamped spring-mass system is simplest free vibration system.
Reason: It has three degrees of freedom.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which of the following is the best method to reduce eddy currents?
Laminating core
Using thick wires
Reducing hysteresis loss
None of these
In an oscillating system, a restoring force is a must. In an L-C circuit, restoring force is provide by
capacitor
inductance
resistance
both (a) and (b)
Given that the mobility of electrons in Ge is 0.4 m2 V-1 S-1 and electronic charge is 1.6 × 10-19 C. The number of donor atom ( per m3 ) semiconductor of conductivity 500 mho/m is
8 × 1021
8 × 1015
5 × 1021
8 × 1016
Two solenoids of equal number of turns having their length and the radii in the same ratio 1:2. The ratio of their self-inductance will be
1:2
2:1
1:1
1:4
A circuit consisting of five resistors each of resistance R, forming a Wheatstone bridge. What is the equivalent resistance of the circuit?
2R
R
2R/3
R/2
An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62oC, its efficiency is doubled. The temperature of source will be
37o C
62o C
99o C
124o C