Question 1 :
We consider the radiation emitted by the human body. Which of the following statements is true?

Question 2 :
If the temperature of the sun (black body) is doubled, the rate of energy received on earth will be increased by a factor of

Question 5 :
The ratio of thermal conductivity of two rods of different material is 5:4. The two rods of same area of cross-section and same thermal resistance will have the lengths in the ratio

Question 6 :
As compared to the person with white skin, the person with black skin will experience

Question 7 :
One quality of a thermometer is that its heat capacity should be small. If <img style='object-fit:contain' width=9 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea1314d1ac76a0b860f9dab"> is a mercury thermometer, <img style='object-fit:contain' width=10 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea1314d1ac76a0b860f9dac"> is a resistance thermometer and <img style='object-fit:contain' width=10 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea131b71ac76a0b860f9fe5"> thermocouple type then

Question 8 :
Relation between the colour and the temperature of a star is given by

Question 9 :
The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by

Question 10 :
The mechanical equivalent of heat <img style='object-fit:contain' width=6 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea132901ac76a0b860fa378"> is

Question 11 :
A wire of cross section $A$ is stretched horizontally between two clamps located $2l\ m$ apart. A weight $W\ kg$ is suspended from the mid-point of the wire. If the mid-point sags vertically through a distance $x &lt; 1$ the strain produced is<br>

Question 12 :
If the interatomic spacing in a steel wire is $3.0A$ and $Y_{steel} = 20 \times 10^{10} N/m^2$ then force constant is<br><br>

Question 13 :
A compressive force of $4 \times 10^4$ N is exerted at the end of a bone of length 30 cm and 4cm^2 square cross sectional area. What will happen to the bone?. The compressive strength of bone is $7.7 \times 10^8 Nm{-2}$

Question 14 :
The breaking force for a wire of diameter D of a material is F. The breaking force for a wire of the same material of radius D is?

Question 15 :
A wire of radius $1 mm$ is bent in the form of a circle of radius $10 cm$. The bending moment will be $(Y =&#160;2\times10^{11}N/m^{2})$<br/>

Question 16 :
The ratio of lengths of two rods A and B of same material is $1:2$ and the ratio of their radii is $2:1,$ then the ratio of rigidity of A and B will be

Question 17 :
The ration of radii of two wires of same material is $2 : 1$. If these wires are stretched by equal force, the ratio of stresses produced in them is

Question 18 :
In $CGS$ system, the Young's modulus of a steel wire is $2 \times 10^{12}$. To double the length of a wire of unit cross section area, the force required is <br><br>

Question 19 :
A small but heavy block of mass $10\ kg$ is attached to a wire $0.3\ m$ long. Its breaking stress is $4.8\times 10^{7} N/m^{2}$. The area of the cross section of the wire is $10^{-6} m^{2}$. The maximum angular velocity with which the block can be rotated in the horizontal circle is

Question 20 :
A uniform cube is subjected to volume compression. Each side gets decreased by 1%, then the bulk strain is