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2151.

Which of the following statements is correct?

Answer»

Which of the following statements is correct?

2152.

What is periodic motion? Explain with the help of two examples.

Answer» What is periodic motion? Explain with the help of two examples.
2153.

144. An artificaial satellite is moving uniformly in a circular orbit of radius 42250 km.find its speed if it takes 24 hour to revolve around the earth.

Answer» 144. An artificaial satellite is moving uniformly in a circular orbit of radius 42250 km.find its speed if it takes 24 hour to revolve around the earth.
2154.

What is the difference between magnetic and non-magnetic materials? Give examples.

Answer»






What is the difference between magnetic and non-magnetic materials? Give examples.




2155.

What is the use of an inclined plane? Give two examples where it is used.

Answer» What is the use of an inclined plane? Give two examples where it is used.
2156.

Definition of sliding friction.

Answer»

Definition of sliding friction.

2157.

7.a long straight horizontal cable carries a current of 2.5 A in the direction 10degree south of west to 10 north of east.the magnetic meredian of the place happen to be 10 west of the geografic meredian.the earth magnetic feild at the location is 0.33 G and the angle of dip is zero .locate the neutral points

Answer» 7.a long straight horizontal cable carries a current of 2.5 A in the direction 10degree south of west to 10 north of east.the magnetic meredian of the place happen to be 10 west of the geografic meredian.the earth magnetic feild at the location is 0.33 G and the angle of dip is zero .locate the neutral points
2158.

State the colours of the rainbow in the correct order.

Answer» State the colours of the rainbow in the correct order.
2159.

Explain why repulsion is the surest test to confirm whether a material is a magnet?

Answer» Explain why repulsion is the surest test to confirm whether a material is a magnet?
2160.

Human Forearm is an example of:

Answer»

Human Forearm is an example of:



2161.

Question 5Why are gases compressible but not liquids?

Answer»


Question 5



Why are gases compressible but not liquids?



2162.

Jack, a genius, built a Time Machine. Unable to find anybody to test it on, he decided to test the time machine himself. He entered the machine and set it for the future year 2355. Lights flashed, the super generator started and the machine started time travel, for the first time ever. When everything became normal again, he stepped out of the time machine and noticed following things: I) There were so many trees, so many that you can’t spot the ground. II) There was 1 river. III) There were nearly 200-400 “Dodo” birds in that area. IV) There were 0 people to be seen anywhere. All these things that he observed (as a mathematician) are-

Answer»

Jack, a genius, built a Time Machine. Unable to find anybody to test it on, he decided to test the time machine himself. He entered the machine and set it for the future year 2355. Lights flashed, the super generator started and the machine started time travel, for the first time ever.

When everything became normal again, he stepped out of the time machine and noticed following things:

I) There were so many trees, so many that you can’t spot the ground.

II) There was 1 river.

III) There were nearly 200-400 “Dodo” birds in that area.

IV) There were 0 people to be seen anywhere.

All these things that he observed (as a mathematician) are-


2163.

The standard unit of length in the SI system is(a) cubit.(b) centimetre.(c) metre.(d) handspan.

Answer» The standard unit of length in the SI system is

(a) cubit.

(b) centimetre.

(c) metre.

(d) handspan.
2164.

Question 8A water tanker filled up to 23 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would(a) move backward(b) move forward(c) be unaffected(d) rise upwards

Answer» Question 8

A water tanker filled up to 23 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would


(a) move backward

(b) move forward

(c) be unaffected

(d) rise upwards
2165.

Which of the following relation is correct for a charge particle moving in static magnetic field? (where symbols have their usual meanings) 1. F.B=02. |FxB|=03. F.B not equal to zero4. |Fxv|=0

Answer» Which of the following relation is correct for a charge particle moving in static magnetic field? (where symbols have their usual meanings)
1. F.B=0
2. |FxB|=0
3. F.B not equal to zero
4. |Fxv|=0
2166.

49.A bar magnet of length 3cm has point A and B along its axis at distance of 24cm and 48cm on the opposite side . ratioof magnetic field at this point will be. 1)8 2)1/2

Answer» 49.A bar magnet of length 3cm has point A and B along its axis at distance of 24cm and 48cm on the opposite side . ratioof magnetic field at this point will be. 1)8 2)1/2
2167.

The speed of sound in hydrogen at STP is V. The speed of sound in a mixture containing 3 parts of hydrogen and 2 parts of oxygen at STP will be

Answer» The speed of sound in hydrogen at STP is V. The speed of sound in a mixture containing 3 parts of hydrogen and 2 parts of oxygen at STP will be
2168.

what s the relation between 1 Au and light year

Answer» what s the relation between 1 Au and light year
2169.

Out of the two, in which case will the object experience more fluid friction? Explain the reason. Case A Case B

Answer» Out of the two, in which case will the object experience more fluid friction? Explain the reason.

Case A Case B
2170.

When you rub your hands together, they become warm. What is this due to?

Answer» When you rub your hands together, they become warm. What is this due to?
2171.

Estimate the area(in sq. cm) of the following figure, if each square in the grid is of area 1 sq cm.

Answer» Estimate the area(in sq. cm) of the following figure, if each square in the grid is of area 1 sq cm.


2172.

Describe a simple experiment to show that light travels in straight lines.

Answer» Describe a simple experiment to show that light travels in straight lines.
2173.

A crow bar has a length of 130 cm. A load of 50 kgf is placed at one end, which is 30 cm away from the fulcrum. Calculate the effort required.

Answer»

A crow bar has a length of 130 cm. A load of 50 kgf is placed at one end, which is 30 cm away from the fulcrum. Calculate the effort required.


2174.

the position of an object changes from \xrightarrow[r]{} =(2icap+jcap)m to \xrightarrow[{r1}]{}=(4icap+3j cap)m in 2s.find its average v

Answer» the position of an object changes from \xrightarrow[r]{} =(2icap+jcap)m to \xrightarrow[{r1}]{}=(4icap+3j cap)m in 2s.find its average v
2175.

What is matter made of

Answer» What is matter made of
2176.

Function of pinhole camera

Answer» Function of pinhole camera
2177.

The magnetic field due to a very small magnet at a point is perpendicular to magnetic moment .find the angle made by the line joining centre of magnet to the point and magnetic moment of bar magnet.

Answer» The magnetic field due to a very small magnet at a point is perpendicular to magnetic moment .find the angle made by the line joining centre of magnet to the point and magnetic moment of bar magnet.
2178.

The dark region formed on a screen when light falls on a opaque object is called ___.

Answer»

The dark region formed on a screen when light falls on a opaque object is called ___.



2179.

Give reasons why : (a) An object thrown upwards reaches a certain height and falls down. (b) We sprinkle talcum powder on a carrom board. (c) The ramp on a railway station has a rough surface. (d) We oil our bicycles regularly.

Answer»

Give reasons why :



(a) An object thrown upwards reaches a certain height and falls down.



(b) We sprinkle talcum powder on a carrom board.



(c) The ramp on a railway station has a rough surface.



(d) We oil our bicycles regularly.

2180.

Name the types of force that we observer in our daily lives.

Answer»

Name the types of force that we observer in our daily lives.

2181.

What is a cow magnet?

Answer»

What is a cow magnet?

2182.

A cubical block rests on a plane of u=root3.The angle through which the plane be inclined to the horizontal so that the ball just slides down will be

Answer» A cubical block rests on a plane of u=root3.The angle through which the plane be inclined to the horizontal so that the ball just slides down will be
2183.

Why do we not have to wind a quartz clock?

Answer»

Why do we not have to wind a quartz clock?

2184.

nta uniform object ladder of length 3.5 m and weighing 250n is placed against a smoth vertical wall with its lower end 1.25 m from the wall . if coefficent of friction between the ladder and floror is 0.3 , then the frictional force acting on the ladder at that point of contact betweenh ladder and floorn ntn

Answer» nta uniform object ladder of length 3.5 m and weighing 250n is placed against a smoth vertical wall with its lower end 1.25 m from the wall . if coefficent of friction between the ladder and floror is 0.3 , then the frictional force acting on the ladder at that point of contact betweenh ladder and floorn ntn
2185.

Why is it said that repulsion is a sure test for magnetism?

Answer» Why is it said that repulsion is a sure test for magnetism?
2186.

Which of the following gets demagnetised when a powerful magnet is kept near it?

Answer»

Which of the following gets demagnetised when a powerful magnet is kept near it?


2187.

Which of the following is the birthplace of a star?

Answer»

Which of the following is the birthplace of a star?


2188.

The color of the shadow formed by a brown colored table is black. If we paint the table with white color, will the color of the shadow change? Explain.

Answer» The color of the shadow formed by a brown colored table is black. If we paint the table with white color, will the color of the shadow change? Explain.
2189.

What type of a lever is the scissor?

Answer»

What type of a lever is the scissor?



2190.

Find the time period of oscillation of a body of mass m dropped in a tunnel along the diameter (2R)of the earth and also find the effect on the time period,if the tunnel is along a chord not along the diameter of earth

Answer» Find the time period of oscillation of a body of mass m dropped in a tunnel along the diameter (2R)of the earth and also find the effect on the time period,if the tunnel is along a chord not along the diameter of earth
2191.

17. How to find a equivalent weight

Answer» 17. How to find a equivalent weight
2192.

to draw maximum current from a battery a given of resis†an ces should be connected in a) parallel b) seies c) mixed d) depends upon relative values of resis†an ces

Answer» to draw maximum current from a battery a given of resis†an ces should be connected in a) parallel b) seies c) mixed d) depends upon relative values of resis†an ces
2193.

for two resistors R_1and R_2 connected in parallel,find the relative error in their equivalent resis†an ce,if R_1=(50\pm2)ohm and R_2=(100\pm3)oh

Answer» for two resistors R_1and R_2 connected in parallel,find the relative error in their equivalent resis†an ce,if R_1=(50\pm2)ohm and R_2=(100\pm3)oh
2194.

John carried out an experiment to find out how different surfaces (P, Q, R and S) affect the braking efficiency of a car traveling at 50 km/h. The results are shown below. Type of road surfacesPQRSStopping distance18 m15 m19 m27 m Which type of road will provide the most friction for the car to stop?

Answer»

John carried out an experiment to find out how different surfaces (P, Q, R and S) affect the braking efficiency of a car traveling at 50 km/h. The results are shown below.
Type of road surfacesPQRSStopping distance18 m15 m19 m27 m
Which type of road will provide the most friction for the car to stop?


2195.

The area of the land shown below is 5.0E + 9 sq m as per the calculator used.The area is equvalent to .

Answer»

The area of the land shown below is 5.0E + 9 sq m as per the calculator used.



The area is equvalent to .

2196.

Give one example each to indicate that the application of a force produces motion stops motion slows down motion changes the direction of motion deforms a body

Answer»

Give one example each to indicate that the application of a force




  1. produces motion

  2. stops motion

  3. slows down motion

  4. changes the direction of motion

  5. deforms a body



2197.

20 people are seated around a circular table. In how many ways can they all simultaneously be shaking hands with others in the table, so that none of the arms cross each other.

Answer» 20 people are seated around a circular table. In how many ways can they all simultaneously be shaking hands with others in the table, so that none of the arms cross each other.
2198.

Rajesh measures the length of a box as 30 cm using a scale that has a broken left end. The actual length of the box is 29 cm. The zero error is _____ cm.1

Answer» Rajesh measures the length of a box as 30 cm using a scale that has a broken left end. The actual length of the box is 29 cm. The zero error is _____ cm.
  1. 1
2199.

How does regular reflection gives rise to image formation ? How does irregular reflection or diffused reflection makes the things visible around us ?

Answer» How does regular reflection gives rise to image formation ? How does irregular reflection or diffused reflection makes the things visible around us ?
2200.

How do we see non-luminous objects?

Answer» How do we see non-luminous objects?