Time Left - 20:00 mins

Step Up Preview: Thermal Physics Class 3

Attempt now to get your rank among 157 students!

Question 1

A long metallic bar is carrying heat from one of its ends to the other end under steady–state. The variation of temperature θ along the length x of the bar from its hot end is best described by which of the following figures?

Question 2

Two bars of equal length and the same cross-sectional area but of different thermal conductivities, k1 and k2, are joined end-to-end as shown in figure. One end of the composite bar is maintained at temperature Th whereas the opposite end is held at Tc.

If there are no heat losses from the sides of the bars, the temperature Tj of the junction is given by

Question 3

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

Question 4

Which of the following is more close to a black body?

Question 5

The rate of cooling R with excess of temperature Δθ varies according to the graph-

Question 6

If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should:

Question 7

A calorimeter (of water equivalent 50g) contains 250g of water and 50g of ice at 0 °C. 30 g of water at 80 °C is added to it. The final condition of the system will be –

Question 8

Water is usually heated by –

Question 9

Ventilators are provided at the top of room –

Question 10

If the temperature of the sun becomes twice its present temperature then –
  • 157 attempts
  • 3 upvotes
  • 1 comment

Tags :

May 20JEE & BITSAT