The temperature of a metal block is increased from 27⁰C to 84⁰C. The rate of radiated energy from the block will increase approximately
Options
(a) 2 times (b) 4 times (c) 8 times (d) […]
Radius of a soap bubble is increased from R to 2R. Work done in this process in terms of surface tension S is
Options
(a) 24 πR²S (b) 48 πR²S (c) 12 πR²S (d) […]
Two bubbles A and B (A>B) are joined through a narrow tube. Then
Options
(a) The size of A will increase (b) The size of B will increase (c) The size of B will […]
The earth radiates in the infrared region of the spectrum. The spectrum is correctly given by
Options
(a) Wien’s law (b) Rayleigh Jean’s law (c) Planck’s law of radiation (d) Stefen’s law
Correct Answer: […]
Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is
Options
(a) √2K (b) 3K (c) 4K/3 […]
Young’s modulus of perfectly rigid body material is
Options
(a) Zero (b) Infinity (c) 1×10¹⁰ N/m² (d) 10×10¹⁰ N/m²
Correct Answer:
Infinity
Explanation:
No explanation available. Be the first to write the explanation for […]
A wire of length 2 m is made from 10 cm³ of copper. A force F is applied so that its length increases by 2 mm. Another wire of length 8 m is made from […]
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 […]
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
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 […]
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