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2651.

How can you check if a substance is conductor or an insulator?

Answer»

How can you check if a substance is conductor or an insulator?

2652.

Question 2 (iii) State whether the following statement is true or false. Similar poles of a magnet repel each other.

Answer»

Question 2 (iii)

State whether the following statement is true or false.
Similar poles of a magnet repel each other.

2653.

Water at room temperature is a liquid because

Answer»

Water at room temperature is a liquid because


2654.

Materials that do not allow electricity to pass through them are called __________.

Answer»

Materials that do not allow electricity to pass through them are called __________.


2655.

The measurement of change of _______ of a body determines its state of motion or of rest.

Answer»

The measurement of change of _______ of a body determines its state of motion or of rest.


2656.

Sunil observed this push sign over a door. Identify the action that needs to be performed by Sunil from the given options.

Answer»

Sunil observed this push sign over a door. Identify the action that needs to be performed by Sunil from the given options.


2657.

Question 6 Which of the following can never form a circular shadow? (a) A ball (b) A flat disc (c) A shoe box (d) An ice cream cone

Answer»

Question 6

Which of the following can never form a circular shadow?

(a) A ball

(b) A flat disc

(c) A shoe box

(d) An ice cream cone

2658.

Can we ignore the quantisation of electric charge? If yes, under what conditions?

Answer»

Can we ignore the quantisation of electric charge? If yes, under what conditions?

2659.

_______are celestial bodies that emit light of their own.

Answer»

_______are celestial bodies that emit light of their own.


2660.

What are rays? Give some examples of rays that we observe daily. [2 MARKS]

Answer»

What are rays? Give some examples of rays that we observe daily. [2 MARKS]

2661.

Which of the following statement is TRUE?

Answer»

Which of the following statement is TRUE?


2662.

Question 2 (c) Mark 'True' or 'False' for following statement: Electric current can pass through a sheet of thermo Col.

Answer»

Question 2 (c)

Mark 'True' or 'False' for following statement:

Electric current can pass through a sheet of thermo Col.

2663.

Statement 1: Stars twinkle but planets do not. Statement 2: Stars have their own light but a planet reflects the light from the stars.

Answer»

Statement 1: Stars twinkle but planets do not.

Statement 2: Stars have their own light but a planet reflects the light from the stars.


2664.

Shaunak and Shaurya were feeling bored. They decided to perform an activity. The followed the steps shown in the image below and built a pin hole camera. What type of image do Shaunak and Shaurya observe on the screen upon using this pin hole camera?

Answer»

Shaunak and Shaurya were feeling bored. They decided to perform an activity. The followed the steps shown in the image below and built a pin hole camera.

What type of image do Shaunak and Shaurya observe on the screen upon using this pin hole camera?


2665.

Give two examples of motion which is both circular as well as periodic

Answer»

Give two examples of motion which is both circular as well as periodic

2666.

Arrange the following modes of transportation from the earliest to the newest ones.

Answer»

Arrange the following modes of transportation from the earliest to the newest ones.


2667.

The weight of a body is because of:

Answer»

The weight of a body is because of:


2668.

What do you mean by luminous and non-luminous objects? Give examples. [3 MARKS]

Answer»

What do you mean by luminous and non-luminous objects? Give examples. [3 MARKS]

2669.

What is oscillatory motion?

Answer» What is oscillatory motion?
2670.

______ can be thought of as an inclined plane wrapped around a cylinder.

Answer»

______ can be thought of as an inclined plane wrapped around a cylinder.


2671.

Those machines which have many parts and carry out multiple processes to complete a task are called ___ machines.

Answer»

Those machines which have many parts and carry out multiple processes to complete a task are called ___ machines.

2672.

A horizontal force of 20 N is acting on the block which is at rest. Static friction acting on the block is

Answer»

A horizontal force of 20 N is acting on the block which is at rest. Static friction acting on the block is


2673.

Question 2 A student observes a tree given in Fig. through a pinhole camera. Which of the diagrams given in Fig. (a) to (d), depicts the image seen by her correctly? (a) (b) (c) (d)

Answer»

Question 2

A student observes a tree given in Fig. through a pinhole camera. Which of the diagrams given in Fig. (a) to (d), depicts the image seen by her correctly?

(a)

(b)

(c)

(d)

2674.

What can you say about the speed of a body in uniform motion?

Answer»

What can you say about the speed of a body in uniform motion?


2675.

Choose the correct statement based on the speed of sound in different media.

Answer»

Choose the correct statement based on the speed of sound in different media.

2676.

The scale should be kept _______ the length while measuring a length.

Answer»

The scale should be kept _______ the length while measuring a length.


2677.

If there are 5 minor divisions between two major divisions, one major division representing 1∘C, one minor division will be equal to:

Answer»

If there are 5 minor divisions between two major divisions, one major division representing 1C, one minor division will be equal to:


2678.

Which among the following is a solid substance at room temperature?

Answer»

Which among the following is a solid substance at room temperature?


2679.

The efficiency of a machine is 90%. If 100 J of work is done by the effort, how much work is obtained at the load of the machine?

Answer»

The efficiency of a machine is 90%. If 100 J of work is done by the effort, how much work is obtained at the load of the machine?

2680.

Statement 1: Dams are constructed to produce hydro electricity. Statement 2: Dams obstruct the flow of water and water level rises thereby increasing the potential energy which is further converted to kinetic and then to electric energy.

Answer»

Statement 1: Dams are constructed to produce hydro electricity.
Statement 2: Dams obstruct the flow of water and water level rises thereby increasing the potential energy which is further converted to kinetic and then to electric energy.

2681.

Wheel and axle can be found in which of the following devices ?

Answer»

Wheel and axle can be found in which of the following devices ?


2682.

Parts of a machine that move or rotate quickly on another surface wear out due to:

Answer»

Parts of a machine that move or rotate quickly on another surface wear out due to:


2683.

The magnitude of friction depends on

Answer»

The magnitude of friction depends on


2684.

The rod that passes through the center of the pulley is called its

Answer»

The rod that passes through the center of the pulley is called its


2685.

An almond nut can be cracked open by a lever of length 1m by applying a force of 100N. If the force is to be reduced to 25 N, what should be the length of the effort arm?

Answer»

An almond nut can be cracked open by a lever of length 1m by applying a force of 100N. If the force is to be reduced to 25 N, what should be the length of the effort arm?


2686.

A cart moves along a track as shown below: Choose the option which is correctly matched to the type of motion.

Answer»

A cart moves along a track as shown below:

Choose the option which is correctly matched to the type of motion.


2687.

A football was in the same position in a football ground for 10 minutes but as soon as Rajat kicks the ball, it starts to move in a straight line. Which of the following options correctly explains the initial and final states of the football?

Answer»

A football was in the same position in a football ground for 10 minutes but as soon as Rajat kicks the ball, it starts to move in a straight line. Which of the following options correctly explains the initial and final states of the football?

2688.

A flexible metal scale is bent and released. It starts to vibrate. The type of motion this can be classified into is ___ motion.

Answer» A flexible metal scale is bent and released. It starts to vibrate. The type of motion this can be classified into is ___ motion.
2689.

Which of the following are examples of insulators.

Answer»

Which of the following are examples of insulators.


2690.

A combination of a movable pulley P1​ with a fixed pulley P2​ is used for lifting up a load W. If the free end of the string moves through a distance x, find the distance by which the load W is raised.

Answer»

A combination of a movable pulley P1 with a fixed pulley P2​ is used for lifting up a load W. If the free end of the string moves through a distance x, find the distance by which the load W is raised.


2691.

Which of the following materials are magnetic?

Answer»

Which of the following materials are magnetic?


2692.

Question 4 Complete the drawing shown in Fig. to indicate where the free ends of the two wires should be joined to make the bulb glow.

Answer»

Question 4

Complete the drawing shown in Fig. to indicate where the free ends of the two wires should be joined to make the bulb glow.

2693.

Question 7 Four pieces of wooden sticks A, B, C and D are placed along the length of 30 cm long scale as shown in Fig. Which one of them is 3.4 cm in length?

Answer»

Question 7

Four pieces of wooden sticks A, B, C and D are placed along the length of 30 cm long scale as shown in Fig. Which one of them is 3.4 cm in length?

2694.

A moving bullet possesses

Answer»

A moving bullet possesses


2695.

Name the force which is used when a farm is ploughed with the help of a tractor.

Answer»

Name the force which is used when a farm is ploughed with the help of a tractor.


2696.

Out of the following which are known as common machines?

Answer»

Out of the following which are known as common machines?


2697.

Falling of a mango from a mango tree is an example of _______ motion.

Answer»

Falling of a mango from a mango tree is an example of _______ motion.


2698.

Noise pollution is caused by which of the following?

Answer»

Noise pollution is caused by which of the following?


2699.

A bottle opener is used to remove the cap of a cold-drink bottle. What type of lever is it?

Answer»

A bottle opener is used to remove the cap of a cold-drink bottle. What type of lever is it?


2700.

What is convergent beam of light?

Answer»

What is convergent beam of light?