Recent questions tagged Cbse

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100 gk questions for class 1

asked Aug 27, 2022 in Class X by Robin (13.0k points)

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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

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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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?

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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A planet as a radius “R” and density “P”. The escape velocity of this planet is _____

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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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 &

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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What is Pascal’s Law?

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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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.

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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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.

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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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?

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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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?

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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Zeroth law of thermodynamics helped in the creation of which scale?

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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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.

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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Which of the following states of matter has the maximum value of mean free path?

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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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

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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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?

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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All waves require material for propagation. True or False?

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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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.

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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Why is the speed of longitudinal waves sound in solids greater than that in liquids?

asked Oct 7, 2021 in Class X by Sandeepthukran (555 points)

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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

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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Gravitational potential energy can be zero but gravitational potential can never be zero. (a) True (b) False

asked Oct 7, 2021 in Class-XI-PHYSICS by Sandeepthukran (555 points)

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