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0
votes
When an object is heated its temperature definitely increases?
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
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What is absolute zero?
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Same amount of heat is added to two substances of same mass having specific heat capacities s1 & s2 such that s1 > s2. Select the correct statement.
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
What will be the value of temperature of hot reservoir in a carnot cycle, if the temperature of cold reservoir is 25°C, heat absorbed from hot reservoir is 12J and heat rejected to cold reservoir is 4J?
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
John Dalton said that atoms are the smallest constituents of elements. True or False?
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
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Consider a gas inside a box. It exerts some pressure on its walls. Find this value. GIven that number of molecules per unit volume be 20, mass of each molecule 10^-20kg, vx^2 = 1m^2/s^2.
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A particle is undergoing SHM. If its potential energy is given by: U = kx^2. What will be the value of x for potential energy to be 1/3rd of kinetic energy? Assume k is force constant.
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Resonance occurs when frequency of forced oscillations is close to natural frequency. True or False?
answered
Oct 5, 2021
in
Class-XI-PHYSICS
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0
votes
A 4kg eagle picks up a 75g snake and raises it 2.5 m from the ground to a branch. What is the work done to raise the bird’s own centre of mass to the branch? (Assume g = 10 m/s^2)
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
What is the magnitude of the ratio of KE and PE of a satellite revolving around a planet in a circular orbit of radius “R”?
answered
Oct 5, 2021
in
Class-XI-PHYSICS
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0
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A satellite of mass “m” is in a circular orbit of radius 1.5R around the earth of radius R. How much energy is required to move it to an orbit of radius 2R?
answered
Oct 4, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A wire has a young’s modulus of 10^5N/m^2, length 1m & radius 3mm. Assuming a uniform cross sectional area, find the radius of wire after it is under a force of 1N from both ends
answered
Oct 4, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Strain can be negative. True or False?
answered
Oct 4, 2021
in
Class-XI-PHYSICS
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0
votes
Which of the following represents volumetric strain?
answered
Oct 4, 2021
in
Class-XI-PHYSICS
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0
votes
Select the correct option. B is bulk modulus. (a) Bgas > Bliquid > Bsolid (b) Bliquid > Bgas> Bsolid (c) Bsolid > Bliquid > Bgas (d) Bliquid > Bgas > Bsolid
answered
Oct 4, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Which of the following stresses causes change in density, as long as force acts on the body? (a) Shear stress (b) Compressive Stress (c) Tensile stress (d) Volumetric stress
answered
Oct 4, 2021
in
Class-XI-PHYSICS
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0
votes
Which of the following is used to measure pressure?
answered
Oct 4, 2021
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Class-XI-PHYSICS
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0
votes
A nail is made pointed at its end to ensure that pressure is more for a given amount of force applied on it. True or False? (a) True (b) False
answered
Oct 4, 2021
in
Class-XI-PHYSICS
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0
votes
A cylindrical tank, filled with water, has an area of 10m^2. A piston covers its entire top surface. A uniformly distributed load of 1000N is applied on the piston from top.
answered
Oct 4, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Surface energy is ________________
answered
Oct 4, 2021
in
Class-XI-PHYSICS
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