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 […]
AFMC2006
34 gram of water at 30⁰C is poured into a calorimeter at 15⁰C.
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
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
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.
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.
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?
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
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
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
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 […]