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501.

40. A car travels 3km before its intial velocity become half then how much will it travel before it comes rest

Answer» 40. A car travels 3km before its intial velocity become half then how much will it travel before it comes rest
502.

A car with speed 60 km/hr takes 8 hours to travel some distance. What should be the increase in the speed if the same distance is to be covered in 712 hours?

Answer» A car with speed 60 km/hr takes 8 hours to travel some distance. What should be the increase in the speed if the same distance is to be covered in 712 hours?
503.

what is move and motion?

Answer» what is move and motion?
504.

निम्नलिखित प्रश्न का उत्तर (50-60 शब्दों में) लिखिए −हिमपात किस तरह होता है और उससे क्या-क्या परिवर्तन आते हैं?

Answer»

निम्नलिखित प्रश्न का उत्तर (50-60 शब्दों में) लिखिए −

हिमपात किस तरह होता है और उससे क्या-क्या परिवर्तन आते हैं?

505.

why the shadow is formed

Answer» why the shadow is formed
506.

relation between kinetic energy and potential energy

Answer» relation between kinetic energy and potential energy
507.

A block of mass at rest 10 kg is being pushed by two equal forces in opposite directions. What can we say about the motion of the block?

Answer»

A block of mass at rest 10 kg is being pushed by two equal forces in opposite directions. What can we say about the motion of the block?


508.

How to locate centre of mass of any body

Answer» How to locate centre of mass of any body
509.

At what temperature will the speed of sound in air becomes double of its value at zero degree celsius

Answer» At what temperature will the speed of sound in air becomes double of its value at zero degree celsius
510.

The machine made with the help of two or more than two simple machines is called a ___ machine.

Answer»

The machine made with the help of two or more than two simple machines is called a ___ machine.

511.

A match box measures 4 cm×2.5 cm×1.5 cm. The volume of a packet containing 12 such boxes is:

Answer»

A match box measures 4 cm×2.5 cm×1.5 cm.
The volume of a packet containing 12 such boxes is:

512.

explain why all the electric appliances in a house stop working when main switch is put off .

Answer» explain why all the electric appliances in a house stop working when main switch is put off .
513.

A small magnet is suspended by a silk thread from a rigid support such that the magnet can freely swing. How will it come to rest?

Answer»

A small magnet is suspended by a silk thread from a rigid support such that the magnet can freely swing. How will it come to rest?


514.

Three identical towels of red, blue, and green colour are hanging on a clothesline in the Sun. What would be the colour of the shadows of these towels?

Answer» Three identical towels of red, blue, and green colour are hanging on a clothesline in the Sun. What would be the colour of the shadows of these towels?
515.

The area of a rectangular piece is 36 cm2. If its width is 4 cm, find its length.

Answer» The area of a rectangular piece is 36 cm2. If its width is 4 cm, find its length.
516.

In a single laced column system, a tie plate of length 300 mm is used at the ends of the column. The minimum thickness of the plate should be:

Answer»

In a single laced column system, a tie plate of length 300 mm is used at the ends of the column. The minimum thickness of the plate should be:

517.

We say that a tree is stationary. But is the tree in motion with respect to some other object?

Answer» We say that a tree is stationary. But is the tree in motion with respect to some other object?
518.

For motion of a satellite is the radius of orbit of satellite calculated from centre of planet or from the surface of Earth?

Answer» For motion of a satellite is the radius of orbit of satellite calculated from centre of planet or from the surface of Earth?
519.

13. Can the base of log be 0

Answer» 13. Can the base of log be 0
520.

Ashwin is required to take the measurement of a wooden box. Which of the following should be the proper position of his eye for taking the reading?

Answer» Ashwin is required to take the measurement of a wooden box. Which of the following should be the proper position of his eye for taking the reading?
521.

the force exerts an impulse I on a particle changing its speed from initial speed u ti final speed 2u. the applied force and the initial velocity are oppositely oriented along same line. the work done by the force is ?

Answer» the force exerts an impulse I on a particle changing its speed from initial speed u ti final speed 2u. the applied force and the initial velocity are oppositely oriented along same line. the work done by the force is ?
522.

What is difference between intermolecular space and intermolecular force?

Answer» What is difference between intermolecular space and intermolecular force?
523.

One millimetre is ____ times of a centimetre.

Answer»

One millimetre is ____ times of a centimetre.

524.

A bird has ___ to keep them light.

Answer»

A bird has ___ to keep them light.



525.

When is a shadow formed?

Answer» When is a shadow formed?
526.

Write the differences between a shadow and an image. [5 MARKS]

Answer» Write the differences between a shadow and an image. [5 MARKS]
527.

The zero mark of a ruler is broken and the length of a box is measured from 2 cm mark of the ruler. The length is found to be 20 cm. What is the actual length of box?

Answer»

The zero mark of a ruler is broken and the length of a box is measured from 2 cm mark of the ruler. The length is found to be 20 cm. What is the actual length of box?


528.

A fish looking up through the water sees the outside world contained in a circular horizon.If the refractive index of water is 4/3 and the fish is 12 cm, below the surface.The radius of the circle is(1) 16/\sqrt7 (2) 26/\sqrt7(3) 36/\sqrt7(4) 46/\sqrt{

Answer» A fish looking up through the water sees the outside world contained in a circular horizon.If the refractive index of water is 4/3 and the fish is 12 cm, below the surface.The radius of the circle is(1) 16/\sqrt7 (2) 26/\sqrt7(3) 36/\sqrt7(4) 46/\sqrt{
529.

Men are running along a road at 9 km/hr behind one another at equal intervals of 20 m. Cyclists are riding in the same direction at 18 km/hr at equal intervals of 30 m. at what speed an observer must travel along the road in opposite direction so that whenever he meets a runner , he also meets a cyclist?

Answer» Men are running along a road at 9 km/hr behind one another at equal intervals of 20 m. Cyclists are riding in the same direction at 18 km/hr at equal intervals of 30 m. at what speed an observer must travel along the road in opposite direction so that whenever he meets a runner , he also meets a cyclist?
530.

the work done by an applied variable force F=x+x^3 from x=0 m to x=2m where x is displacement is

Answer» the work done by an applied variable force F=x+x^3 from x=0 m to x=2m where x is displacement is
531.

Which criterion is being used to classify lever of three types?

Answer»

Which criterion is being used to classify lever of three types?


532.

___ is now considered as a dwarf planet.

Answer»

___ is now considered as a dwarf planet.

533.

what is the value of 1 light year in m

Answer» what is the value of 1 light year in m
534.

97. B2 is paramagnetic but C2 is diamagnetic. Explaine

Answer» 97. B2 is paramagnetic but C2 is diamagnetic. Explaine
535.

100.Two identical magnetic dipole P and Q of moment M each,placed at a separation 2d,with their axis parallel to each other. The magnetic fields midway (M) between the dipoles is Bo. If one of them turned about centre by 90', magnetic field at M is

Answer» 100.Two identical magnetic dipole P and Q of moment M each,placed at a separation 2d,with their axis parallel to each other. The magnetic fields midway (M) between the dipoles is Bo. If one of them turned about centre by 90', magnetic field at M is
536.

The force which resists motion in a liquid is called___.

Answer» The force which resists motion in a liquid is called___.
537.

Tension in a string isi) Gravitational forceii) Electromagnetic forceiii) Strong nuclear forceiv) Weak nuclear force

Answer» Tension in a string is

i) Gravitational force
ii) Electromagnetic force
iii) Strong nuclear force
iv) Weak nuclear force
538.

Why do we say that force is a vector quantity? Give one more example of vector quantity

Answer» Why do we say that force is a vector quantity? Give one more example of vector quantity
539.

A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y, and Z.

Answer» A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y, and Z.
540.

Explain Kirchoff's rule

Answer» Explain Kirchoff's rule
541.

Magnetite is a/an ______.

Answer»

Magnetite is a/an ______.


542.

What is the difference between crozier and clamp connection

Answer» What is the difference between crozier and clamp connection
543.

A sphere 3 cm radius acts like a black body if it is in equilibrium with its surroundings and absorbs 30 kilowatt of energy radiated to it from the surrounding then the temperature of the sphere will be

Answer» A sphere 3 cm radius acts like a black body if it is in equilibrium with its surroundings and absorbs 30 kilowatt of energy radiated to it from the surrounding then the temperature of the sphere will be
544.

How much deep inside the earth should a man go so that his weight becomes one - fourth of that at a point which is at a height R above the surface of earth ? R=radius of earth

Answer» How much deep inside the earth should a man go so that his weight becomes one - fourth of that at a point which is at a height R above the surface of earth ? R=radius of earth
545.

List three properties of a shadow.

Answer» List three properties of a shadow.
546.

We ___ measure the length of a curved line directly by using a metre scale. (can/can not)

Answer»

We ___ measure the length of a curved line directly by using a metre scale. (can/can not)

547.

Which of the following words will appear the same when viewed in a plane mirror when both are kept vertically?

Answer»

Which of the following words will appear the same when viewed in a plane mirror when both are kept vertically?

548.

Three students measured the length of a corridor and reported their measurements. The values of their measurements were different. What could be the reason for the difference in their measurements?

Answer»

Three students measured the length of a corridor and reported their measurements. The values of their measurements were different. What could be the reason for the difference in their measurements?

549.

Light is(a) visible and also makes objects on which it falls visible.(b) invisible but makes objects on which it falls visible.(c) invisible but becomes visible when it falls on an object.(d) sometimes visible and sometimes invisible but it always makes objects on which it falls visible.

Answer» Light is

(a) visible and also makes objects on which it falls visible.

(b) invisible but makes objects on which it falls visible.

(c) invisible but becomes visible when it falls on an object.

(d) sometimes visible and sometimes invisible but it always makes objects on which it falls visible.
550.

Question 2 (vi) State whether the following statement is true or false. A compass can be used to find East-West direction at any place.

Answer»

Question 2 (vi)

State whether the following statement is true or false.
A compass can be used to find East-West direction at any place.