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Class 11th

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Class 11th Physics Mechanical Properties of Fluids

The force required to stretch a steel wire of cross section 4 cm2 to 1.02 times its length would be (Y = 2*10¹¹N m^–2)

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alok kumar singh

Contributor-Level 10

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Class 11th Physics System of Particles and Rotational Motion

Consider a uniform square plate of side 'a' and mass 'm'. The moment of inertia of this plate about an axis perpendicular to its plane and passing through one of its corners is:

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alok kumar singh

Contributor-Level 10

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Class 11th Physics System of Particles and Rotational Motion

Centre of mass for a uniform semi-circular ring will be at (from centre)

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

COM for half ring =2R/π

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Class 11th Work, Energy and Power

If the coefficient of restitution is 0.5, what is the percentage loss of energy on each rebounding of a ball dropped from a height?

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alok kumar singh

Contributor-Level 10

h² = e²h₁

h² = h₁/4

Energy loss =mgh₁ - mgh₂ /mgh₁*100 = 75%

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Class 11th Waves

The following figure depicts snapshot of a wave travelling in a medium. Which pair of particles are in phase?

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alok kumar singh

Contributor-Level 10

Both points B and G are moving up and are at same distance from equilibrium position at the instant.

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Class 11th Chemistry

A metal ion M³⁺loses 3 electrons, its oxidation number will be

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alok kumar singh

Contributor-Level 10

Oxidation no. of a substance is proportional to the charge on it. In this case the charge is + 6 hence oxidation state will be +6

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Class 11th Chemistry

For the given reaction

Which of the following is correct?

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alok kumar singh

Contributor-Level 10

In an exothermic reaction on decreasing temperature, reaction goes in the forward direction.

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Class 11th Thermodynamics

The P-V diagram of 4 g of helium gas for a certain process A → B is shown in the figure. What is the heat given to the gas during the process A → B?

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alok kumar singh

Contributor-Level 10

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Class 11th Physics

What should be the minimum coefficient of static friction between an inclined plane and the solid cylinder, for which the cylinder does not slip on the inclined plane?

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