A bubble is rising from bottom of a lake. The volume of bubble becomes
A bubble is rising from bottom of a lake. The volume of bubble becomes 8 times as it reaches the top. The atmospheric pressure is equal to H, The depth of the lake
Options […]
A bubble is rising from bottom of a lake. The volume of bubble becomes 8 times as it reaches the top. The atmospheric pressure is equal to H, The depth of the lake
Options […]
34 gram of water at 30⁰C is poured into a calorimeter at 15⁰C. The temperature of water is 20⁰C when equilibrium is achieved. The water equivalent of the calorimeter is
Options
(a) 68g […]
In adiabatic expansion, product of PV
Options
(a) Decreases (b) Increases (c) Changes erratically (d) None of these
Correct Answer:
Decreases
Explanation:
In adiabatic expansion, there is cooling effect. Therefore the temperature falls.
The order of the electric field near the earth’s surface is
Options
(a) 100 v/m (b) 500 v/m (c) 200 v/m (d) none of these
Correct Answer:
100 v/m
Explanation:
The electric field […]
Two point charges +2 coulomb and +10 coulomb repel each other with a force of 12 N. Charges of -2 coulomb are given to each of these charges, then the force of interaction is
The current through an inductor changes from 3 A to 2 A is 1 m/s. If induced e.m.f. in inductor is 5V then L is
Options
(a) 5×10⁻² H (b) 5×10⁻³ H (c) 2.5×10⁻³ […]
Which of the following is the function of the step-up transformer?
Options
(a) Low voltage, high current to high voltage and low current (b) Low voltage, low current to high voltage and high […]
We get Balmer series when electron comes from
Options
(a) Higher to 2nd orbit (b) 2nd to higher orbit (c) Higher to first orbit (d) None of these
Correct Answer:
Higher to 2nd […]
If alpha, beta and gamma rays carry same momentum, which has the longest wavelength
Options
(a) Alpha rays (b) Beta rays (c) Gamma rays (d) None, all have same wavelength
Correct Answer:
None, […]
Photoelectric current from a given photocell will depend upon
Options
(a) Number of photons striking per second (b) Frequency of incident photon (c) Material of the target (d) None of the above
Correct […]
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