### 1 mark Physics questions:

**Ques:** State the meaning of uniform circular motion.

**Ques:** What is meant by free fall ?

**Ques:** State a relation between thrust and pressure.

**Ques: **Why is the motion of an athlete moving along the circular path an accelerated motion ?

**Ques:** State Newton’s first law of motion.

**Ques:** State any one phenomena related to the Universal Law of Gravitation.

**Ques:** State universal law of gravitation.

**Ques:** Define mass of an object ?

**Ques:** Why is G called the Universal Constant ?

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**Ques:** What can you say about the motion of a body if its displacement – time graph is a straight line parallel to the time axis ?

**Ques:** An athelete completes one round of a circular track of diameter 49m in 20s. Calculate the distance covered and displacement at the end of 30s.

**Ques:** Define Uniform acceleration

### 2 mark Physics questions:

**Ques:** A cyclist travels a distance of 4 km from P to Q and then moves a distance of 3 km at 2 right angle to PQ. Find his resultant displacement graphically.

**Ques:** What would happen if a fielder stops the fast moving ball suddenly ? Justify your answer.

**Ques:** A stone is dropped from the roof of a building. It takes 4s, to reach the ground. Find the height of the building, (g = 9.8 m/s^{2})

**Ques:** A bus decreases its speed from 80 km/h to 50 km/h in 4s. Find the acceleration of the bus.

**Ques:** Compare in tabular form the properties of a true solution and colloids with respect to Tyndall effect and stability.

**Ques:** What is Tyndall Effect ? “Tyndall Effect can be observed when sunlight passes through the canopy of dense forest.” Explain how this occurs.

**Ques:** A bus decreases its speed from 80 km/h to 50 km/h in 4s. Find the acceleration of the bus.

**Ques:** A cyclist travels a distance of 4 km from P to Q and then moves a distance of 3 km at right angle to PQ. Find his resultant displacement graphically.

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**Ques:** A stone is dropped from the roof of a building. It takes 4s, to reach the ground. Find the height of the building

**Ques:** Write the relation for collision of two balls A and B and hence state the related law.

**Ques:** Name the SI unit of measuring temperature.

The boiling point of water is 100° C under normal atmospheric pressure. Convert this temperature in SI units.

**Ques:** Define thrust and pressure and state the SI units in which they are measured.

**Ques:** What are the changes possible on an object at rest if we apply on it:

(a) a balanced force.

(b) an unbalanced force

**Ques:** (a) Why does the rider fall in the forward direction when a running horse stops suddenly ?

(b) Why is it easier to stop a tennis ball in comparison to a cricket ball moving with the same speed ?

**Ques:** An athlete always runs some distance before taking a jump. Why ?

**Ques:** An electric train is moving with a velocity of 120 km/hr. How much distance will it cover in 30 s ?

**Ques:** Name the SI unit of measuring temperature.

The boiling point of water is 100° C under normal atmospheric pressure. Convert this temperature in SI units.

**Ques:** What is meant by relative density of a substance ? The relative density of mercury is 13.6. What is its density in SI units ? Given that the density of water is 1000 kg/m^{3}.

**Ques:** A bullet of mass 25 g is fired horizontally with a velocity of 100 m/s from a gun of mass 5 kg. Calculate the recoil velocity of the gun.

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**Ques:** What can you say about the motion of an object whose distance time graph is : (i) a straight line, parallel to the time axis

(ii) a straight line passing through the origin making an angle from the time axis.

**Ques:** Define force and state its any two effects.

**Ques:** Can a body have constant speed and still be accelerating ? Give an example.

### 3 marks Physics questions:

**Ques:** A ball thrown vertically upwards rises to a height of 20 m. Calculate :

(i) the velocity with which the ball is thrown upwards and

(ii) the time taken by the ball to reach the highest point, (g = 10 m/s^{2})

**Ques:** What happens to the Gravitational force between two objects if :

(a) the mass of one object is doubled.

(b) the distance between the objects is doubled.

(c) the masses of both the objects are doubled. Give reason in each case.

**Ques:** “We can easily move our hand in air but not through any solid material.” Justify the statement giving any three possible reasons.

**Ques:** A man pushes a box of mass 50 kg with force of 80 N. What will be the acceleration of the box due to this force ? What would be the acceleration if the mass were doubled ?

**Ques:** Explain why the value of ‘g’ differs while moving from poles to equator on the surface of the earth. State how would it’s value change on moving :

(a) towards the centre of the earth.

(b) away from the earth.

**Ques:** Assuming that the mass of Earth is 100 times larger than the mass of moon and the radius of Earth is about 4 times as that of moon, show that the weight of an object on moon is l/6th of that on earth.

**Ques:** Assuming that the mass of Earth is 100 times larger than the mass of moon and the radius of Earth is about 4 times as that of moon, show that the weight of an object on moon is l/6th of that on earth.

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**Ques:** A bus accelerates uniformly from 54 km/h to 72 km/h in 10 s. Calculate :

(i) the acceleration

(ii) the distance covered by the bus in that time

**Ques:** Define uniformly accelerated motion. Also show that the area under a velocity-time 3 graph gives the magnitude of displacement.

**Ques:** List in tabular form any three differences between ‘g’ and ‘G’.

**Ques:** What is uniform circular motion. How is uniform circular motion regarded as an accelerated motion. Give an example of such a motion.

**Ques:** State the action and reaction in the following :

(a) moving rocket

(b) firing of a bullet from a gun

(c) a person walking on the floor.

**Ques:** (a) Define momentum of a body.

(b) A ball is thrown vertically upward. What is its momentum at the highest point ?

(c) State the law of conservation of momentum.

**Ques:** A ball thrown up vertically returns to the thrower after 4 s. Find

(a) the velocity with which it was thrown up.

(b) the maximum height it reaches and

(c) its position after 3 s.

An object experiences a net zero external unbalanced force. Is it possible for the object to be moving with a non – zero velocity ? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason

### 5 mark Physics questions:

**Ques:** (a) State Newton’s 1st and 3rd law of motion.

(b) A car of mass 1800 kg moving with a speed of 10 m/s is brought to rest after a covering a distance of 50m. Calculate the force acting on the car.

**Ques:** (a) State Newton’s second law of motion. Use this law to find a method to measure force acting of on an object.

(b) From a rifle of mass 4kg a bullet of mass 50kg is fired horizontally with an initial velocity of 40 ms^{-1}. Calculate the initial recoil velocity of the rifle.

**Ques:** A ball thrown vertically upwards rises to a height of 20 m. calculate :

(i) the velocity with which the ball is thrown upwards and

(ii) the time taken by the ball to reach the highest point

**Ques:** Distinguish between mass and weight of an object. How does weight of an object change on moving from equator to poles ? When can the weight of an object be zero ?

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**Ques:** A bus travels a of distance 120 km with a speed of 40 km/h and returns with a speed of 30 km/h. Calculate the average speed for the entire journey.

**Ques:** (a) State Newton’s second law of motion. Using this law obtain the unit of force and define it.

(b) State the Law of Conservation of Momentum. Using this law explain why a gun recoils.

**Ques:** (a) How much momentum will an object of mass 10 kg transfer to the floor, if it falls from a height of 0.8 m ?

(b) Explain why is it difficult for a fireman to hold a hose, which ejects large amount of water at a high velocity.

**Ques:** (a) In a high jump event the athletes are made to fall on a sand bed or on a cushioned bed. Why?

(b) Define momentum. State its S.I. unit.

(c) An object of mass 10 kg is accelerated uniformly from rest to a velocity of 8m/ s in 6 s, calculate the final momentum of the object.

**Ques:** (a) When a motor car make a sharp turn at a high speed, we tend to get thrown to one side. Why?

(b) State Newton’s 1st and 3rd law of motion.

(c) A force of 5N gives a body of mass ‘m’ an acceleration of 10m/s^{2}, Calculate the mass of the body in grams.