Science (English Medium) Class 11 - CBSE Question Bank Solutions for Physics

Which of the following diagrams (Figure) does not represent a streamline flow?

Along a streamline ______.

Streamline flow is more likely for liquids with ______.

1. high density.
2. high viscosity.
3. low density.
4. low viscosity.

Refer to the plot of temperature versus time (figure) showing the changes in the state of ice on heating (not to scale).

1. The region AB represents ice and water in thermal equilibrium.
2. At B water starts boiling.
3. At C all the water gets converted into steam.
4. C to D represents water and steam in equilibrium at boiling point.

A cylinder containing an ideal gas is in vertical position and has a piston of mass M that is able to move up or down without friction (Figure). If the temperature is increased ______.

Volume versus temperature graphs for a given mass of an ideal gas are shown in figure at two different values of constant pressure. What can be inferred about relation between P₁ and P₂?

An inflated rubber balloon contains one mole of an ideal gas, has a pressure p, volume V and temperature T. If the temperature rises to 1.1 T, and the volume is increased to 1.05 V, the final pressure will be ______.

The molecules of a given mass of a gas have root mean square speeds of 100 ms⁻¹ at 27°C and 1.00 atmospheric pressure. What will be the root mean square speeds of the molecules of the gas at 127°C and 2.0 atmospheric pressure?

Two molecules of a gas have speeds of 9 × 10 6 ms⁻¹ and 1 × 106 ms⁻¹, respectively. What is the root mean square speed of these molecules?

A gas mixture consists of molecules of types A, B and C with masses m_A > m_B > m_C. Rank the three types of molecules in decreasing order of average K.E.

A gas mixture consists of molecules of types A, B and C with masses m_A > m_B > m_C. Rank the three types of molecules in decreasing order of rms speeds.

An insulated container containing monoatomic gas of molar mass m is moving with a velocity v_o. If the container is suddenly stopped, find the change in temperature.

Explain why there is no atmosphere on moon.

Consider a rectangular block of wood moving with a velocity v₀ in a gas at temperature T and mass density ρ. Assume the velocity is along x-axis and the area of cross-section of the block perpendicular to v₀ is A. Show that the drag force on the block is `4ρAv_0 sqrt((KT)/m)`, where m is the mass of the gas molecule.

Motion of an oscillating liquid column in a U-tube is ______.

A body is performing S.H.M. Then its ______.

1. average total energy per cycle is equal to its maximum kinetic energy.
2. average kinetic energy per cycle is equal to half of its maximum kinetic energy.
3. mean velocity over a complete cycle is equal to `2/π` times of its π maximum velocity. 
4. root mean square velocity is times of its maximum velocity `1/sqrt(2)`.

Displacement versus time curve for a particle executing S.H.M. is shown in figure. Identify the points marked at which (i) velocity of the oscillator is zero, (ii) speed of the oscillator is maximum.

Draw a graph to show the variation of P.E., K.E. and total energy of a simple harmonic oscillator with displacement.

Find the displacement of a simple harmonic oscillator at which its P.E. is half of the maximum energy of the oscillator.

A mass of 2 kg is attached to the spring of spring constant 50 Nm^–1. The block is pulled to a distance of 5 cm from its equilibrium position at x = 0 on a horizontal frictionless surface from rest at t = 0. Write the expression for its displacement at anytime t.