Science (English Medium) कक्षा ११ - CBSE Question Bank Solutions

It is said that mercury is used in defining the temperature scale because it expands uniformly with  temperature. If the temperature scale is not yet defined, is it logical to say that a substance expands uniformly with temperature?

Can the bulb of a thermometer be made of an adiabatic wall?

Why do marine animals live deep inside a lake when the surface of the lake freezes?

The length of a brass rod is found to be less on a hot summer day than on a cold winter day as measured by the same aluminium scale. Can we conclude that brass shrinks on heating?

The density of water at 4°C is supposed to be 1000 kg m^–3. Is it same at sea level and at high altitude?

A spherical shell is heated. The volume changes according to the equation V_θ = V₀ (1 + γ^θ). Does the volume refer to the volume enclosed by the shell or the volume of the material making up the shell?

Which of the curves in the following figure represents the relation between Celsius and Fahrenheit temperatures?

Which of the following pairs may give equal numerical values of the temperature of a body?

If the temperature of a uniform rod is slightly increased by ∆t, its moment of inertia I about a line parallel to itself will increase by

The temperature of water at the surface of a deep lake is 2°C. The temperature expected at the bottom is

An aluminium sphere is dipped into water at 10°C. If the temperature is increased, the force of buoyancy

A spinning wheel is brought in contact with an identical wheel spinning at identical speed. The wheels slow down under the action of friction. Which of the following energies of the first wheel decreases?

(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal

Is heat a conserved quantity?

A spinning wheel A is brought in contact with another wheel B, initially at rest. Because of the friction at contact, the second wheel also starts spinning. Which of the following energies of the wheel B increases?
(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal

In a calorimeter, the heat given by the hot object is assumed to be equal to the heat taken by the cold object. Does it mean that heat of the two objects taken together remains constant?

A body A is placed on a railway platform and an identical body B in a moving train. Which of the following energies of B are greater than those of A, as seen from the ground?
(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal

As the temperature is increased, the time period of a pendulum

When a solid melts or a liquid boils, the temperature does not increase even when heat is supplied. Where does the energy go?

A person's skin is more severely burnt when put in contact with 1 g of steam at 100°C than when put in contact with 1 g of water at 100°C. Explain

The atmospheric temperature in the cities on sea-coast change very little. Explain