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The value of the gravitational potential at the centre of a ring of radius “a” and mass “M” is _____ (a) zero (b) -(G*M)/a (c) -(G*M)/a^1/2 (d) infinite
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Oct 7, 2021
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An object is projected vertically upwards with a velocity (gr) ^1/2. What is the maximum height reached by the object if “R” is the radius of the earth and “g” is the acceleration due to gravity?
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Oct 7, 2021
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A planet as a radius “R” and density “P”. The escape velocity of this planet is _____
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Oct 7, 2021
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Class-XI-PHYSICS
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A wire with a radius of 5mm is hung freely from the ceiling. A load of 5N is applied to its free end. Find the elongation in the wire if its volume is 7.85*10^-5m^3 &
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Oct 7, 2021
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Class-XI-PHYSICS
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Sandeepthukran
cbse
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What is Pascal’s Law?
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Oct 7, 2021
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Class-XI-PHYSICS
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The speed of efflux, in case of a tank with a hole at the bottom, depends upon which of the following factors? Assume that the area of the tank is > > area of hole.
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Oct 7, 2021
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Class-XI-PHYSICS
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A steel and a copper bar are joined end to end. The area of the steel bar is half the area of the copper bar. Their lengths are equal to 10cm each.
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Oct 7, 2021
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Class-XI-PHYSICS
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What is the net amount of energy per unit time being received by a body having a temperature of 40 °C in a surrounding of 60°C?
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Oct 7, 2021
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Class-XI-PHYSICS
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If we hold a metal rod from one end and dip the other in a source of fire, what will happen to the temperature of the rod at steady state?
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Oct 7, 2021
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Class-XI-PHYSICS
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Zeroth law of thermodynamics helped in the creation of which scale?
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Oct 7, 2021
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Class-XI-PHYSICS
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A carnot engine extracts 1200J of energy from a hot reservoir. What is the amount of work done by it? Temperatures of hot and cold reservoirs are 200K and 150K respectively.
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Oct 7, 2021
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Which of the following states of matter has the maximum value of mean free path?
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A force given by: F = -2(x – 1)^2acts on a particle at rest. Select the correct option regarding the same. (a) Force acts on particle along the positive x direction (b) Force is never zero
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Oct 7, 2021
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Class-XI-PHYSICS
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What is the time period of kinetic energy of a particle in SHM,if the time period of SHM is 4s?
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Oct 7, 2021
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Class-XI-PHYSICS
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All waves require material for propagation. True or False?
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Oct 7, 2021
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A string has a mass of 100gm & is under a tension of 10N. What should be its length if the speed of transverse waves is to be 10m/s on the string.
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Oct 7, 2021
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Class-XI-PHYSICS
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The escape velocity for an object to leave the surface of the earth does not depend on its size, shape, mass or direction of projection of the body. (a) True (b) False
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Oct 7, 2021
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Gravitational potential energy can be zero but gravitational potential can never be zero. (a) True (b) False
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Oct 7, 2021
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Class-XI-PHYSICS
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Sandeepthukran
cbse
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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 by the eagle on the snake? (Assume g = 10 m/s^2)
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Oct 6, 2021
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Class-XI-PHYSICS
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The maximum value of gravitational potential energy is zero.
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Oct 6, 2021
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Class-XI-PHYSICS
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A satellite is seen after every 8 hours. If it rotates opposite to that of the earth, what is its angular velocity about the centre of the earth?
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Oct 6, 2021
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Class-XI-PHYSICS
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Assume that a satellite executes perfectly circular orbits around a perfectly circular sphere. The work done by the satellite in 1 complete revolution is _____
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Oct 6, 2021
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Class-XI-PHYSICS
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A wire has a cross sectional area ‘A’, length ‘L’ and young’s modulus ‘Y’. It is pulled by a force ‘F’ which causes a total extension of length ‘l’. The force F is so adjusted that the wire is only slowly stretched.
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Oct 6, 2021
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Class-XI-PHYSICS
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Viscosity is said to be internal friction between fluid layers. What type of force is it?
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Oct 6, 2021
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Class-XI-PHYSICS
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An ice cube is kept on the surface of an aluminium block and another ice cube on the surface of a plastic block. Both blocks have the same temperature. Select the correct statement.
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Why is mercury used in thermometers?
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Oct 6, 2021
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Class-XI-PHYSICS
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For a constant volume gas thermometer select the correct statement.
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Oct 6, 2021
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Select the correct statement.
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Oct 6, 2021
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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.
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Oct 6, 2021
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Class-XI-PHYSICS
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The rate of cooling of water increases with fall in temperature. True or False?
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Oct 6, 2021
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Class-XI-PHYSICS
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