HSC Science (General) इयत्ता ११ वी - Maharashtra State Board Question Bank Solutions

Solve the numerical example.

Write down the number of significant figures in the following: 0.003 m², 0.1250 gm cm^-2, 6.4 x 10⁶ m, 1.6 x 10^-19 C, 9.1 x 10^-31 kg.

Solve the numerical example.

The diameter of a sphere is 2.14 cm. Calculate the volume of the sphere to the correct number of significant figures.

Answer in one sentence.

Define friction.

Answer in one sentence.

Why force of static friction is known as ‘self-adjusting force’?

Answer in one sentence.

Name two factors on which the coefficient of friction depends.

State any four methods to reduce friction.

Answer in short.

What is rolling friction? How does it arise?

Answer in short.

Explain how lubricants help in reducing friction.

Answer in short.

State the laws of static friction.

Answer in short.

State the laws of kinetic friction.

Answer in short.

State advantages of friction.

State disadvantages of friction.

Long answer type question.

Define coefficient of static friction and coefficient of kinetic friction. Give the necessary formula for each.

Calculate the coefficient of static friction for an object of mass 50 kg placed on horizontal table pulled by attaching a spring balance. The force is increased gradually it is observed that the object just moves when spring balance shows 50 N.

Answer the following.

A block of mass 37 kg rests on a rough horizontal plane having coefficient of static friction 0.3. Find out the least force required to just move the block horizontally.

A body of mass 37 kg rests on a rough horizontal surface. The minimum horizontal force required to just start the motion is 68.5 N. In order to keep the body moving with constant velocity, a force of 43 N is needed. What is the value of coefficient of static friction?

The internal resistance of a cell of emf 2 V is 0.1 Ω it is connected to a resistance of 0.9 Ω. The voltage across the cell will be ______.

Solve the following problem.

A battery after a long use has an emf 24 V and an internal resistance 380 Ω. Calculate the maximum current drawn from the battery? Can this battery drive starting motor of car?

Solve the following problem.

A battery of emf 12 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A,

1. Calculate resistance of resistor.
2. Calculate terminal voltage of the battery when the circuit is closed.

Answer the following question.

Describe what is meant by order of magnitude.