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0
votes
Select the correct statement.
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
The sun emits light having maximum intensity at a wavelength 468nm. Assume emissivity of sun is 1. Calculate its surface temperature. σ= 5.67*10^-8W/m^2K^4.
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
The rate of cooling of water increases with fall in temperature. True or False?
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
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A liquid cools from 65°C to 55°C in 5 mins. If the surrounding temperature is 35℃, calculate the time taken for temperature to fall from 45°C to 35°C.
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Which of the following variables is intensive?
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
What is the coefficient of performance of a refrigerator? Let Q1 be the heat released to hot reservoir, Q2 be the heat extracted from a cold reservoir & W be the work done on the refrigerator.
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A process is carried out between 2 systems. It is possible for entropy of one system to decrease. True or False?
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
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What is the correct order of steps for a carnot cycle?
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
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What is the number of molecules in 2.24L of SO2 at STP?
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A particle is in SHM. When displacement is ‘a‘ potential energy is 8J. When displacement is ‘a‘ potential energy is 18J.
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A spring block system is on a horizontal surface. The block is compressed by 10cm. What should be the coefficient of friction between the block and ground such that the block comes to a stop at the mean position?
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
What is the length of a seconds pendulum?
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
What is the minimum velocity required for an object of mass “m” to escape the gravitational pull of a planet of mass “M” and radius “R” from its surface?
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
The radius of a planet is “R” and mass is “M”. A satellite revolves around it in an orbital radius of “r” and an orbital velocity “v”. How would you express the acceleration due to gravity on the surface of the planet?
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A satellite revolves around a planet of radius “Q”. If the angular velocity of the satellite is “w” and the radius of the orbit is “4nQ”, where “n” is an integer,
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
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CARTOSAT is a group of geostationary satellites sent up by India.
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
The height of the geostationary satellites above the earth’s surface is approximately 36,000 km.
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A material have a stress strain curve which can look similar to the equation y = x^2 (for all x>0). True or False?
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A lake has a depth of 500m. The bulk modulus of water is 2*10^9N/m^2. Calculate the fractional compression, ΔV/V, of water at the bottom of the lake.
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Assume a force of 30 N is distributed over a surface of area 2m^2 in such a way that at each point force can be considered to act at an angle of 30° to the normal at that point.
answered
Oct 5, 2021
in
Class-XI-PHYSICS
cbse
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