31 Year NEET Previous Year Questions: Thermal Properties of Matter - NEET MCQ
30 Questions MCQ Test Physics Class 11 - 31 Year NEET Previous Year Questions: Thermal Properties of Matter
N molecules each of mass m of a gas A and 2N molecules each of mass 2m of gas B are contained in the same vessel which is maintained at temperature T. The mean square velocity of molecules of B type is v2 and the mean square rectangular component of the velocity of A type is denoted by ω2. Then ω2/v2 [1991]
10 gm of ice cubes at 0°C are released in a tumbler (water equivalent 55 g) at 40°C.Assuming that negligible heat is taken from the surroundings, the temperature of water in the tumbler becomes nearly (L = 80 cal/g) [1988]
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A centigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 140°. What is the fall in temperature as registered by the Centigrade thermometer ?
Thermal capacity of 40 g of aluminium (s = 0.2 cal /g K) is [1990]
Mercury thermometer can be used to measure temperature upto [1992]
If the temperature of the sun is doubled, the rate of energy received on earth will be increased by a factor of [1993]
A body cools from 50.0°C to 48°C in 5s. How long will it take to cool from 40.0°C to 39°C?Assume the temperature of surroundings to be 30.0°C and Newton's law of cooling to be valid.
A beaker full of hot water is kept in a room. If it cools from 80°C to 75°C in t1 minutes, from 75° C to 70°C in t2 minutes and from 70°C to 65°C in t3 minutes, then [1995]
… (1)
…(2)
… (3)A black body is at temperature of 500 K. It emits energy at rate which is proportional to [1997]
The radiant energy from the sun, incident normally at the surface of earth is 20 k cal/m2 min. What would have been the radiant energy, incident normally on the earth, if the sun had a temperature, twice of the present one? [1998]
If 1 g of steam is mixed with 1 g of ice, then the resultant temperature of the mixture is [1999]
The coefficient of linear expansions of brass and steel are α1 and α2 respectively. When we take a brass rod of length ℓ1 and a steel rod of length ℓ2 at 0ºC, then the difference in their lengths (ℓ2 – ℓ1) will remain the same at all temperatures if [1995, 1999]
According to question , l' – l'' = l1 – l2
The presence of gravitational field is required for the heat transfer by [2000]
A black body has maximum wavelength λm at temperature 2000 K. Its corresponding wavelength at temperature 3000 K will be
A cylindrical rod having temperature T1 and T2 at its end. The rate of flow of heat is Q1 cal/sec.If all the linear dimensions are doubled keeping temperature constant, then the rate of flow of heat Q2 will be [2001]
Wien's law is concerned with [2002]
Radiation from which of the following sources, approximates black body radiation best? [2002]
Two rods of thermal conductivities K1 and K2, cross-sections A1 and A2 and specific heats S1 and S2 are of equal lengths. The temperatures of two ends of each rod are T1 and T2. The rate of flow of heat at the steady state will be equal if [2002]
Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and 2K, respectively.
The equivalent thermal conductivity of the slab is [2003]
If λm denotes the wavelength at which the radiative emission from a black body at a temperature T K is maximum, then [2004]
Which of the following circular rods (given radius r and length l), each made of the same material and whose ends are maintained at the same temperature will conduct most heat? [2005]
The temperature of in version of a thermocouple is 6200C and the neutral temperature is 3000C. What is the temperature of cold junction ? [2005]
A black body at 1227°C emits radiations with maximum intensity at a wavelength of 5000Å. If the temperature of the body is increased by 1000°C, the maximum intensity will be observed at
A black body is at 727° C. It emits energy at a rate which is proportional to [2007]
If the cold junction of a thermo-couple is kept at 0°C and the hot junction is kept at T°C then the relation between neutral temperature (Tn) and temperature of inversion (Ti) is [2007]
= Neutral temperature
Assuming the sun to have a sph erical outer surface of radius r, radiating like a black body at temperature t°C, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is [2007] where σ is the Stefan’s constant.
On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39° W and 239° W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39° C on the Celsius scale? [2008]
= constant
An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20° C? The temperature of boiling water is 100° C. [2008]
The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures T1 and T2 (T1 > T2). The rate of heat transfer, 
through the rod in a steady state is given by: [2009]
A black body at 227°C radiates heat at the r ate of 7 cals/cm2s. At a temperature of 727°C, the rate of heat radiated in the same units will be:
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Important Questions for 31 Year NEET Previous Year Questions: Thermal Properties of Matter
31 Year NEET Previous Year Questions: Thermal Properties of Matter MCQs with Answers
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