Which of the following is an example of ideal black body?
Which of the following is an example of ideal black body?
Options
(a) Kajal (b) Black board (c) A pin hole in a box (d) None of these
Correct Answer:
A pin hole in […]
Physics
In the Young’s modulus experiment, if length of wire and radius both are doubled,
In the Young’s modulus experiment, if length of wire and radius both are doubled, then the value of Y will becomes
Options
(a) Two times (b) Four times (c) Remains the same (d) Half
According to Hook’s law, force is proportional to
According to Hook’s law, force is proportional to
Options
(a) 1/r (b) 1/r² (c) r (d) r²
Correct Answer:
r
Explanation:
No explanation available. Be the first to write the explanation for this question […]
Two metal rods 1 and 2 of same lengths have same temperature difference
Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K₁ and K₂ and cross sectional areas A₁ and A₂, respectively. If the rate of […]
The breaking stress of a wire depends upon
The breaking stress of a wire depends upon
Options
(a) Length of wire (b) Radius of wire (c) Material of wire (d) Shape of the cross-section
Correct Answer:
Material of wire
Explanation:
No explanation […]
The molar specific heats of an ideal gas at constant pressure and volume are denoted
The molar specific heats of an ideal gas at constant pressure and volume are denoted by Cp and Cv, respectively. If γ = Cp/Cv and R is the universal gas constant, then Cv is equal […]
The temperature of a body falls from 50⁰C to 40⁰C in 10 minute. If the temperature
The temperature of a body falls from 50⁰C to 40⁰C in 10 minute. If the temperature of the surroundings is 20⁰C, then temperature of the body after another 10 minute will be
Options
(a) […]
A uniform plank of Young’s modulus Y is moved over a smooth horizontal surface
A uniform plank of Young’s modulus Y is moved over a smooth horizontal surface by a constant horizontal force F. The area of cross-section of the plank is A. The compressive strain on the plank […]
A piece of iron is heated in a flame. It first comes dull red then becomes reddish
A piece of iron is heated in a flame. It first comes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using […]
The maximum wavelength of radiations emitted at 900K is 4 µm. What will be the maximum
The maximum wavelength of radiations emitted at 900K is 4 µm. What will be the maximum wavelength of radiations emitted at 1200 K?
Options
(a) 3 µm (b) 0.3 µm (c) 1 µm (d) […]