Light Test

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Light Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves the source of light away from the lens on its principal axis, the intensity of light

A
Remains constant

B
Continuously increases

C
Continuously decreases

D
First increases than decreases.

Solution

In the given situation, the intensity of light decreases continuously with increase in distance.
Question 2
1 / -0

Three light bulbs are concealed from an observer by an opaque wall as shown. Without shifting the positions of the observer and the bulbs, the images of which of the bulbs can the observer see from the plane mirror?

A
P and P

B
P and Q

C
Only P

D
Q and R

Solution

Bulbs P and Q lies in the plane of incidence of mirror while bulb R does not. Thus, only the images of the bulbs P and Q can be seen by the observer from the plane mirror.
Question 3
1 / -0

United Football Club are playing an evening match. The team's jersey has blue and white stripes. What colour would the stripes appear under floodlights which produce a yellow light?

A
Black and yellow

B
Blue and white

C
Blue and yellow

D
Black and white

Solution

An object appears blue when it reflects blue colour and absorbs rest of colours when light falls on it. But when yellow light falls on blue colour, it absorbs yellow and reflects nothing thus appears black. The white stripe reflects the yellow colour which falls on it, thus appears yellow.

Question 4

1 / -0

Match the column I with column II and column III and select correct option from the codes given below. (Note: These columns are for convex lens.)

	Column I (Position of the object)		Column II (Position of the image)		Column III (Type of Image
(a)	Object beyond 2F	(i)	At 2F	(p)	Real, inverted, large
(b)	Object at 2F	(ii)	Same side as the object	(q)	Virtual, erect, magnified
(c)	Object between F and 2F	(iii)	Beyond 2F	(r)	Real, inverted, same size
(d)	Object within the focal length	(iv)	Between F and 2F	(s)	Real, inverted, diminished

(a)-(ii)-(p); (b)-(iii)-(q); (c)-(iv)-(r); (d)-(i)-(s)

(a)-(iv)-(s); (b)-(i)-(r); (c)-(iii)-(p); (d)-(ii)-(q)

(a)-(iii)-(q); (b)-(ii)-(s); (c)-(ii)-(r); (d)-(iii)-(p)

(a)-(i)-(r); (b)-(iv)-(p); (c)-(i)-(s); (d)-(iv)-(q)

Question 5
1 / -0

Read the given statements and select the correct option.

Statement 1: A beam of light emitted by the point source placed in water always diverges in air.
Statement 2: The refracted ray moves away from normal when a ray goes from a denser medium to a rarer medium.

A
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

C
Statement 1 is true but statement 2 is false.

D
Both statements 1 and 2 are false.
Question 6
1 / -0

Consider the following statements and select the option which correctly identifies true (T) and false (F).

(i) Part that gives colour to the eye is iris.
(ii) Transparent outer layer that refracts light is lens.
(iii) Retina is a light sensitive layer of the eye.
(iv) Cornea is a region without any sensory cells.

A

(i) (ii) (iii) (iv)

F T F T

B

(i) (ii) (iii) (iv)

T F T T

C

(i) (ii) (iii) (iv)

T T F F

D

(i) (ii) (iii) (iv)

F F T T

Solution

Most of the refraction occurs in cornea. Cornea is a region without sensory cells. It is transparent and allows the light to enter the eye. Part that gives colour to the eyes is retina.

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Light Test - 3

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Light Test - 3

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SHARING IS CARING

Question 1

Remains constant

Continuously increases

Continuously decreases

First increases than decreases.

Solution

Question 2

P and P

P and Q

Only P

Q and R

Solution

Question 3

Black and yellow

Blue and white

Blue and yellow

Black and white

Solution

Question 4

(a)-(ii)-(p); (b)-(iii)-(q); (c)-(iv)-(r); (d)-(i)-(s)

(a)-(iv)-(s); (b)-(i)-(r); (c)-(iii)-(p); (d)-(ii)-(q)

(a)-(iii)-(q); (b)-(ii)-(s); (c)-(ii)-(r); (d)-(iii)-(p)

(a)-(i)-(r); (b)-(iv)-(p); (c)-(i)-(s); (d)-(iv)-(q)

Question 5

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

Statement 1 is true but statement 2 is false.

Both statements 1 and 2 are false.

Question 6

(i) (ii) (iii) (iv) F T F T

(i) (ii) (iii) (iv) T F T T

(i) (ii) (iii) (iv) T T F F

(i) (ii) (iii) (iv) F F T T

Solution

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(i) (ii) (iii) (iv)

F T F T

(i) (ii) (iii) (iv)

T F T T

(i) (ii) (iii) (iv)

T T F F

(i) (ii) (iii) (iv)

F F T T