List of top Science Questions asked in CBSE Class IX

A driver of a car travelling at \(52\) \(km \;h^{–1}\) applies the brakes Shade the area on the graph that represents the distance travelled by the car during the period. (b) Which part of the graph represents uniform motion of the car?

A stone of 1 kg is thrown with a velocity of 20 m s^–1 across the frozen surface of a lake and comes to rest after traveling a distance of 50 m. What is the force of friction between the stone and the ice?

The speed-time graph for a car is shown is Fig.

Find how far does the car travel in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period.
Which part of the graph represents uniform motion of the car?

Find the energy in joules consumed in 10 hours by four devices of power 500 W each.

A hockey ball of mass 200 g traveling at 10 m s^–1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 m s^–1. Calculate the magnitude of the change of momentum that occurred in the motion of the hockey ball by the force applied by the hockey stick.

Diagrammatically show the difference between the three types of muscle fibres.

How do good animal husbandry practices benefit farmers?

Name the following.

Tissue that forms the inner lining of our mouth.
Tissue that connects muscle to bone in humans.
Tissue that transports food in plants.
Tissue that stores fat in our body.
Connective tissue with a fluid matrix.
Tissue present in the brain.

Complete the following chart:

What is genetic manipulation? How is it useful in agricultural practices?

Fig shows the distance-time graph of three objects A, B and C. Study the graph and answer the following questions:

Which of the three is travelling the fastest?
Are all three ever at the same point on the road?
How far has C travelled when B passes A?
How far has B travelled by the time it passes C?

An object of mass 1 kg travelling in a straight line with a velocity of 10 m s^–1 collides with, and sticks to, a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.

A bullet of mass 10 g traveling horizontally with a velocity of 150 m s^–1 strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block. Also, calculate the magnitude of the force exerted by the wooden block on the bullet.

Explain the following giving examples.
(a) Saturated solution
(b) Pure substance
(c) Colloid
(d) Suspension

Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Substance Dissolved	Temperature in K
Substance Dissolved	283	293	313	333	353
	Solubility
Potassium nitrate	21	32	62	106	167
Sodium chloride	36	36	36	37	37
Potassium chloride	35	35	40	46	54
Ammonium chloride	24	37	41	55	66

(a) What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?
(b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.
(c) Find the solubility of each salt at 293 K. Which salt has the highest solubility at this temperature?
(d) What is the effect of change of temperature on the solubility of a salt?

State which of the following situations are possible and give an example for each of these:

an object with a constant acceleration but with zero velocity
an object moving with an acceleration but with uniform speed.
an object moving in a certain direction with an acceleration in the perpendicular direction.

Name A,B,C,D,E and F in the following diagram showing change in its state

Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

An object of mass 100 kg is accelerated uniformly from a velocity of 5 m s^–1 to 8 m s^–1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

Which separation techniques will you apply for the separation of the following?

(a) Sodium chloride from its solution in water
(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride
(c) Small pieces of metal in the engine oil of a car
(d) Different pigments from an extract of flower petals
(e) Butter from curd
(f) Oil from water
(g) Tea leaves from tea
(h) Iron pins from sand
(i) Wheat grains from husk
(j) Fine mud particles suspended in water

Define valency by taking examples of silicon and oxygen.

An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling 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.

Why is it advised to tie any luggage kept on the roof of a bus with a rope?

Which type of cell division is required for growth and repair of body and which type is involved in formation of gametes?

Why is ice at 273K more effective in cooling than water at the same temperature?

List of top Science Questions asked in CBSE Class IX

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