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Recent questions in Class-XI-PHYSICS
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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.
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Oct 6, 2021
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Which of the following variables is intensive?
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Oct 6, 2021
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Class-XI-PHYSICS
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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.
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Oct 6, 2021
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Class-XI-PHYSICS
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A process is carried out between 2 systems. It is possible for entropy of one system to decrease. True or False?
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Oct 6, 2021
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What is the correct order of steps for a carnot cycle?
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Oct 6, 2021
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Class-XI-PHYSICS
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What is the number of molecules in 2.24L of SO2 at STP?
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Oct 6, 2021
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Class-XI-PHYSICS
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A particle is in SHM. When displacement is ‘a‘ potential energy is 8J. When displacement is ‘a‘ potential energy is 18J.
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Oct 6, 2021
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Class-XI-PHYSICS
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Sandeepthukran
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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?
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Oct 6, 2021
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Class-XI-PHYSICS
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What is the length of a seconds pendulum?
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Oct 5, 2021
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Class-XI-PHYSICS
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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?
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Oct 5, 2021
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Class-XI-PHYSICS
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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?
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Oct 5, 2021
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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,
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Oct 5, 2021
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CARTOSAT is a group of geostationary satellites sent up by India.
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Oct 5, 2021
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Class-XI-PHYSICS
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The height of the geostationary satellites above the earth’s surface is approximately 36,000 km.
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Oct 5, 2021
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Class-XI-PHYSICS
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A material have a stress strain curve which can look similar to the equation y = x^2 (for all x>0). True or False?
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Oct 5, 2021
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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.
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Oct 5, 2021
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Class-XI-PHYSICS
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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.
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Oct 5, 2021
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Class-XI-PHYSICS
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When an object is heated its temperature definitely increases?
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Oct 5, 2021
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What is absolute zero?
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Oct 5, 2021
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Class-XI-PHYSICS
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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.
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Oct 5, 2021
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Class-XI-PHYSICS
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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?
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Oct 5, 2021
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Class-XI-PHYSICS
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John Dalton said that atoms are the smallest constituents of elements. True or False?
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Oct 5, 2021
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Class-XI-PHYSICS
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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.
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Oct 5, 2021
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Class-XI-PHYSICS
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cbse
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What is the ratio of specific heats for a diatomic gas?
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Oct 5, 2021
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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.
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Oct 5, 2021
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Class-XI-PHYSICS
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Resonance occurs when frequency of forced oscillations is close to natural frequency. True or False?
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Oct 5, 2021
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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)
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Oct 5, 2021
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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”?
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Oct 5, 2021
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Class-XI-PHYSICS
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Sandeepthukran
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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?
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Oct 4, 2021
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Class-XI-PHYSICS
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Sandeepthukran
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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
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Oct 4, 2021
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Class-XI-PHYSICS
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Sandeepthukran
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