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5151.

An electrician uses rubber or plastic gloves while repairing an electric appliance because ______.

Answer»

An electrician uses rubber or plastic gloves while repairing an electric appliance because ______.


5152.

Can we use a a long wire in a fuse What are the factors which affect the resistance

Answer»

Can we use a a long wire in a fuse

What are the factors which affect the resistance

5153.

1. Which property of concave mirror is utilized for using them as shaving mirrors? 2. Light passes through a rectangular glass slab and through a triangular glass prism. Using proper ray diagram, explain in what way does the direction of the two emergent beams differs with respect to the incident beam of light 3. A concave lens has a focal length of 50 cm. Calculate its power.

Answer» 1. Which property of concave mirror is utilized for using them as shaving mirrors?
2. Light passes through a rectangular glass slab and through a triangular glass prism. Using proper ray diagram, explain in what way does the direction of the two emergent beams differs with respect to the incident beam of light
3. A concave lens has a focal length of 50 cm. Calculate its power.
5154.

What is meant by natural,forced and gravitional convection?

Answer»

What is meant by natural,forced and gravitional convection?

5155.

List the fundamental quantities along with their units in SI system.

Answer» List the fundamental quantities along with their units in SI system.
5156.

A particle of mass 1 kg was sliding with a velocity of 10 m/s on a rough floor. It comes to rest after 5 s. The rate at which floor warms up is ___ W.

Answer»

A particle of mass 1 kg was sliding with a velocity of 10 m/s on a rough floor. It comes to rest after 5 s. The rate at which floor warms up is

___ W.
5157.

In an image formed by a mirror, the left of the object appears on the right and the right appears on the left. This is known as ___.

Answer»

In an image formed by a mirror, the left of the object appears on the right and the right appears on the left. This is known as ___.

5158.

Define the term calorie. How is it related to joule?

Answer»

Define the term calorie. How is it related to joule?

5159.

Now we will perform an activity. Follow below steps: 1) Go to the kitchen and take a plastic plate from there. 2) Ask your mother for a few common pins. 3) Take some of the pins and sprinkle it on the plate. 4) Now the best part, Take a magnet and keep it on the same plate. You will find that all pins are stuck to the magnet. But this was something you might have expected. If you are a keen observer then you might have noticed that the most of the pins were stuck ______.

Answer»

Now we will perform an activity. Follow below steps:
1) Go to the kitchen and take a plastic plate from there.
2) Ask your mother for a few common pins.
3) Take some of the pins and sprinkle it on the plate.
4) Now the best part, Take a magnet and keep it on the same plate.

You will find that all pins are stuck to the magnet. But this was something you might have expected. If you are a keen observer then you might have noticed that the most of the pins were stuck ______.


5160.

The point inside earth's surface where an earthquake begins is known as:

Answer» The point inside earth's surface where an earthquake begins is known as:
5161.

What energy conversion takes place in hydropower plants?

Answer»

What energy conversion takes place in hydropower plants?


5162.

(i) What do you mean by heat? (ii) How is the temperature of an object measured? (iii) Why conduction is possible only in solids? [5 MARKS]

Answer»

(i) What do you mean by heat?
(ii) How is the temperature of an object measured?

(iii) Why conduction is possible only in solids?
[5 MARKS]

5163.

If a footballer passes the ball to his teammate (the path followed by the ball is shown in the picture), the type of motion experienced by the ball is :

Answer»

If a footballer passes the ball to his teammate (the path followed by the ball is shown in the picture), the type of motion experienced by the ball is :


5164.

A bucket of soapy water has been accidentally spilled on a marble floor. Which of the following statements is correct?

Answer»

A bucket of soapy water has been accidentally spilled on a marble floor. Which of the following statements is correct?


5165.

What is a lodestone?

Answer»

What is a lodestone?

5166.

When the red light is allowed to fall on a blue object, It will appear ___ in colour.

Answer»

When the red light is allowed to fall on a blue object, It will appear ___ in colour.

5167.

A clinical thermometer is made of?

Answer»

A clinical thermometer is made of?


5168.

Which of the following are the usages of Noble gas?

Answer»

Which of the following are the usages of Noble gas?


5169.

A block is sliding down on an inclined plane. The velocity changes at a constant rate from 10 cm/s to 15 cm/s in 2 seconds. What is its acceleration?

Answer»

A block is sliding down on an inclined plane. The velocity changes at a constant rate from 10 cm/s to 15 cm/s in 2 seconds. What is its acceleration?


5170.

The two temperature scales with the same interval step size are the

Answer»

The two temperature scales with the same interval step size are the


5171.

What is uniform motion?

Answer»

What is uniform motion?

5172.

What is an Erect Image ?

Answer» What is an Erect Image ?
5173.

Which scale is used on the clinical thermometers in India?

Answer»

Which scale is used on the clinical thermometers in India?


5174.

Can plants perform photosynthesis in any light other than sunlight?

Answer» Can plants perform photosynthesis in any light other than sunlight?
5175.

The top of a roof made of asbestos is painted white. Why?

Answer» The top of a roof made of asbestos is painted white. Why?
5176.

Why increasing tje number of turns of the coil increases the magnetic field of an electromagnet?

Answer»

Why increasing tje number of turns of the coil increases the magnetic field of an electromagnet?

5177.

1. What’s the difference in electromagnet and solenoid 2. State the factors on which the amount of heat produced depends

Answer»

1. What’s the difference in electromagnet and solenoid

2. State the factors on which the amount of heat produced depends

5178.

Which of the following is true with respect to periodic motion?

Answer»

Which of the following is true with respect to periodic motion?


5179.

If the temperature of the sun becomes twice its present temperature, then

Answer»

If the temperature of the sun becomes twice its present temperature, then


5180.

Examples of scalar quantity are :

Answer»

Examples of scalar quantity are :


5181.

Which of the following is NOT a property of magnet?

Answer»

Which of the following is NOT a property of magnet?


5182.

Two slabs A and B of different materials but of the same thickness are joined as shown in the figure. The thermal conductivities of A and B are k1 and k2 respectively. The thermal conductivity of the composite slab will be

Answer»

Two slabs A and B of different materials but of the same thickness are joined as shown in the figure. The thermal conductivities of A and B are k1 and k2 respectively. The thermal conductivity of the composite slab will be


5183.

10 points of difference between mass and weight

Answer»

10 points of difference between mass and weight

5184.

___ consists of a frictionless pivot attached with a bob.

Answer» ___ consists of a frictionless pivot attached with a bob.
5185.

We are able to see objects due to the reflection of light. Which of the following examples shows the reflection of light?

Answer»

We are able to see objects due to the reflection of light. Which of the following examples shows the reflection of light?


5186.

How circuit diagrams of electric circuits are useful in the real world?

Answer» How circuit diagrams of electric circuits are useful in the real world?
5187.

Sam was cycling on a circular track. He travels 600m while cycling 1 round of the track. Find his speed of cycling if he can complete 12 rounds of the track in 30 minutes.

Answer»

Sam was cycling on a circular track. He travels 600m while cycling 1 round of the track. Find his speed of cycling if he can complete 12 rounds of the track in 30 minutes.


5188.

The magnitude of displacement is equal to minimum possible distance between two positions.

Answer»

The magnitude of displacement is equal to minimum possible distance between two positions.


5189.

The picture shows a bucket being whirled around in a vertical circle, with a help of a string with very high constant speed. What is a correlation between above action and the motion of the moon around the Earth?

Answer»

The picture shows a bucket being whirled around in a vertical circle, with a help of a string with very high constant speed. What is a correlation between above action and the motion of the moon around the Earth?


5190.

The volume of water required to fill half a tank of length 3 m, breadth 4 m and height 5 m is:

Answer»

The volume of water required to fill half a tank of length 3 m, breadth 4 m and height 5 m is:

5191.

While doing an experiment to measure the temperature at which water boils, Ram keeps the laboratory thermometer completely immersed in water without touching the surface or bottom of the beaker. On the other hand does Shyam does the same experiment with the thermometer touching the bottom of the beaker. Who is more likely to get an accurate reading?

Answer»

While doing an experiment to measure the temperature at which water boils, Ram keeps the laboratory thermometer completely immersed in water without touching the surface or bottom of the beaker. On the other hand does Shyam does the same experiment with the thermometer touching the bottom of the beaker. Who is more likely to get an accurate reading?


5192.

Copper is used in which of the following Industries?

Answer»

Copper is used in which of the following Industries?


5193.

Q.After we wear a spectacle with concave lens virtual images are formed at the focus of the myopic eye (a) In a normal eye real and inverted images are formed . Does this mean people with normal vision and myopic eyes view things differently? (B)Do people with myopic eyes with spectacles see things closer than they actually are why?

Answer»

Q.After we wear a spectacle with concave lens virtual images are formed at the focus of the myopic eye

(a) In a normal eye real and inverted images are formed . Does this mean people with normal vision and myopic eyes view things differently?

(B)Do people with myopic eyes with spectacles see things closer than they actually are why?

5194.

Which one of the following places is unlikely to be affected by a cyclone?

Answer»

Which one of the following places is unlikely to be affected by a cyclone?


5195.

Select the correct statement with respect to the tropical storms for the given figure.

Answer»

Select the correct statement with respect to the tropical storms for the given figure.


5196.

Question 2 (ii) Which of the following are not correct? (ii) Every object moves with a constant speed.

Answer»

Question 2 (ii)
Which of the following are not correct?

(ii) Every object moves with a constant speed.

5197.

Which of the following is not an example of to and fro motion?

Answer»

Which of the following is not an example of to and fro motion?


5198.

State difference between a convex and a concave lens in their (a) appearance, and (b) action on the incident light.

Answer»

State difference between a convex and a concave lens in their (a) appearance, and (b) action on the incident light.

5199.

When an electric current flows through a wire :

Answer»

When an electric current flows through a wire :


5200.

Is light visible?

Answer» Is light visible?