CLASS - 10 SCIENCE IMPORTANT QUESTIONS PART -

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CLASS - 10 SCIENCE IMPORTANT QUESTIONS PART - 1

QUESTION NO .1

Write the characteristic of image formed by plane mirror.

ANSWER .1

Image formed by a plane mirror is always virtual and erect. The size of image is equal to the that of object. The image is formed as far behind the mirror as the object is in front of it .

QUESTION NO. 2

Write the name of mirror which is used as rear view in vehicle .

ANSWER NO. 2

Convex mirrors are commonly used as rear view mirrors in vehicle .

QUESTION NO. 3

Define magnification of image .

ANSWER NO. 3

Magnification produced by spherical image gives the relative extent to which the image of an object is magnified with respect to the object size .

QUESTION NO. 4

What is meant by power of accomodation of the eye .

ANSWER NO. 4

The ability of the eye lens to adjust its focal length is called accomodation .

QUESTION NO. 5

What is aperture .

ANSWER NO. 5

The diameter of the reflecting surface of spherical mirror is called aperture .

QUESTION NO. 6

What is the relationship between the radius of cuvature R, and focal length f, of a spherical mirror .

ANSWER NO. 6

R= 2f (the radius of curvature is found to be equal to the twice the focal length.)

QUESTION NO. 7

Which type of mirror is used as sharing mirror, torch, search light and vehicle headlight. 

ANSWER  NO. 7

Concave mirror are commonly used to get powerful parallel beams of light and dentist uses concave mirror to see large image of teeth.

QUESTION NO. 8

The radius of curvature of a spherical mirror is 20 cm. What is its focal length.

ANSWER NO. 8

Radius of curvature    R = 2f
                               f = R/2 =  20/2
                                           =  10 cm

QUESTION NO. 9

What is power of lens. Define 1 diopter of power of lens.

ANSWER NO. 9

The power of a lens is defined as the reciprocal of its focal length. It is represented by the letter P- 
                                               P = 1/f
    1 diopter is the power of a lens whose focal length is 1 meter.
                                         1D = 1/1m.

QUESTION NO. 10

Write the name of lens which is called converging lens. Why it is called converging lens.

ANSWER NO.  10

Convex lens converges light rays. Hence convex lenses are also called converging lenses.

 ALSO SEE IMPORTANT QUESTIONS OF 1 MARK

 From question no. 31 to 40

From question no. 1 to 10

 From question no. 21 to 30

From question no. 41 to 50

From question no. 51 to 60

From question no. 61 to 70

From question no. 71 to 80

From question no. 81 to 90

From question no. 101 to 110

From question no. 111 to 120

From question no. 121 to 130

                                    

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