HSC Science (General) 11th Standard - Maharashtra State Board Question Bank Solutions for Physics

Answer briefly.

State the expression for apparent frequency when the source is stationary and the listener is

1. moving towards the source
2. moving away from the source

Answer briefly.

State the expression for apparent frequency when source of sound and listener are

1. moving towards each other
2. moving away from each other

Solve the following problem.

A police car travels towards a stationary observer at a speed of 15 m/s. The siren on the car emits a sound of frequency 250 Hz. Calculate the recorded frequency. The speed of sound is 340 m/s.

The sound emitted from the siren of an ambulance has a frequency of 1500 Hz. The speed of sound is 340 m/s. Calculate the difference in frequencies heard by a stationary observer if the ambulance initially travels towards and then away from the observer at a speed of 30 m/s.

Choose the correct option.

The waves used by artificial satellites for communication purposes are

Answer briefly.

Name the three basic units of any communication system.

Answer briefly.

What is meant by noise?

Answer briefly.

What is meant by bandwidth?

Answer briefly.

Explain the necessity of a carrier wave in communication.

Solve the numerical problem.

A transmitting antenna at the top of a tower has a height of 32 m and that of the receiving antenna is 50 m. What is the maximum distance between them for satisfactory communication in line of sight mode? The given radius of Earth is 6.4 × 10⁶ m.

What is a conical pendulum?

Answer the following question.

Show that its time period is given by, 2π`sqrt((l cos theta)/("g"))` where l is the length of the string, θ is the angle that the string makes with the vertical, and g is the acceleration due to gravity.

Define angular velocity.

Answer the following question.

Show that the centripetal force on a particle undergoing uniform circular motion is -mrω².

Solve the following problem.

A car moves in a circle at a constant speed of 50 m/s and completes one revolution in 40 s. Determine the magnitude of the acceleration of the car.

Solve the following problem.

A particle moves in a circle with a constant speed of 15 m/s. The radius of the circle is 2 m. Determine the centripetal acceleration of the particle.

Solve the following problem.

A projectile is thrown at an angle of 30° to the horizontal. What should be the range of initial velocity (u) so that its range will be between 40m and 50 m? Assume g = 10 m s^-2.

Answer the following question.

Explain spherical aberration for spherical mirrors. How can it be minimized? Can it be eliminated by some curved mirrors?

Explain chromatic aberration for spherical lenses. 

Answer the following question in detail.

What is achromatism? Derive a condition to achieve achromatism for a lens combination. State the conditions for it to be converging.