Time Left - 10:00 mins

NEET 2020 Physics: Transfer of Heat Quiz

Attempt now to get your rank among 412 students!

Question 1

Two spheres of the same material have radii 1 m and 4 m and temperatures 4000 K and 2000 K respectively. The ratio of energy radiated per second by the first sphere to that by the second is

Question 2

A black body emits heat at the rate of 20 W. When its temperature is 727 ° C. Another black body emits heat at the rate of 15W, when its temperature is 227 º C. Compare the area of the surface of the two bodies, if the surrounding is at NTP.

Question 3

A composite slab is prepared b pasting two plates of thicknesses

and

and thermal conductivities

and

. The slabs have equal cross-sectional area. Find the equivalent conductivity of the slab.

Question 4

The wavelength of maximum energy released during an atomic explosion was 2.93 × 10^–10 m. Given that Wien's constant is 2.93 × 10^–3 m-K, the maximum temperature stained must be of the order of

Question 5

Two rigid boxes containing different ideal gases are placed on table. Box A contains one mole of nitrogen at temperature T₀, while box B contains 1 mole of helium at temperature 7/3 T₀. The boxes are then put into thermal contact with each other and heat flows between them until the gases reach a common final temperature (ignore the heat capacity of boxes) then the final temperature of gases, T_f in terms of T₀ is

412 attempts
3 upvotes
8 comments

Tags :

Mar 3NEET & AIIMS