The temperature coefficient of resistance of a wire is 0.00125oC-1. At 300 K, its resistance is 1 Ω. The resistance of the wire will be 2 Ω at which temperature ?
1,154 K
1,100 K
1,400 K
1,127 K
A block of ice at - 10oC is slowly heated and converted to steam at 100oC. Which of the following curves represents the phenomenon qualitatively ?
Which of the following is closer to a black body ?
Blackboard paint
Green leaves
Black holes
Red roses
Temperature of a black body increases from 327oC to 927oC, the initial energy possessed is 2 kJ. What is its final energy ?
32 kJ
320 kJ
1200 kJ
32 J
A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500o C and then placed on a large ice block. The maximum amount of ice that can melt is :(sp.heat of Cu = 0.39 J/gm/o C and heat of diffusion of water = 335 J/gm)
1.53 kg
1.50 kg
1.55 kg
1.6 kg
The radiator of a car contains 20 litre of water. If the motor supplies calorie heat to it, then rise in temperature will be :
10o C
20o C
100o C
103 oC
Compared to burn due to air at 100oC, a burn due to steam at 100oC is :
More dangerous
Less dangerous
Equally dangerous
Can't determine
Heat current is maximum in which of the following (rods are of identical dimension) ?
A composite rod made of copper and steel is heated. Then
It bends with steel on concave side
It bends with copper on concave side
It does not expand
Data insufficient
In determining the temperature of a distant star, one makes use of:
Kirchhoff's law
Stefan's law
Wien's displacement law
Millman's theorem
