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
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 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 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 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 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 wavelength of radiations emitted at 1200 K?
Options
(a) 3 µm (b) 0.3 µm (c) 1 µm (d) […]
The area of cross-section of a steel wire (Y=2.0×10¹¹ N/m²) is 0.1 cm². The force required to double its length will be
Options
(a) 2×10¹² N (b) 2×10¹¹ N (c) 2×10¹⁰ N (d) 2×10⁶ […]
Shearing stress causes change in
Options
(a) Length (b) Breadth (c) Shape (d) Volume
Correct Answer:
Shape
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting […]
A black body radiates 20 W at temperature 227⁰C. It temperature of the black body is changed to 727⁰C, then its radiating power will be
Options
(a) Lamp black (b) Platinum black (c) Highly […]
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