MCQ 11 Mark
No matter how far you stand from a mirror, your image appears always erect. The mirror is likely to be…
Answer
View full question & answer→Correct option: D.
either plane or convex
D
Questions
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49 questions · timed · auto-graded
MCQ 21 Mark
If a spherical mirror is immersed in water, then its focal length…
- Achanges
- ✓does not change
- Cmay or may not change
- Dbecomes zero
Answer
View full question & answer→Correct option: B.
does not change
B
MCQ 31 Mark
A boy is running with speed v towards a plane mirror, then at what speed, his image will be running towards him?
- ✓$2v$
- B$> v$
- C$v$
- D$< v$
Answer
View full question & answer→Correct option: A.
$2v$
A
MCQ 41 Mark
From which of the following letters, can we obtain its laterally inverted image?
- AW
- BX
- CY
- ✓Z
Answer
View full question & answer→Correct option: D.
Z
D
MCQ 51 Mark
From which of the following letters, we cannot obtain its laterally inverted image?
- AN
- ✓O
- CP
- DQ
Answer
View full question & answer→Correct option: B.
O
B
MCQ 61 Mark
Which type of image of an object cannot be obtained by a convex lens?
- AReal and diminished
- BReal and enlarged
- ✓Virtual and diminished
- DVirtual and enlarged
Answer
View full question & answer→Correct option: C.
Virtual and diminished
C
MCQ 71 Mark
- AC
- ✓F
- CA
- DP
Answer
View full question & answer→Correct option: B.
F
B
MCQ 81 Mark
What happens to an obliquely incident ray travelling from glass to air?
- AIt bends towards the normal.
- ✓It bends away from the normal.
- CIt does not undergo refraction.
- DIt turns back following the original path.
Answer
View full question & answer→Correct option: B.
It bends away from the normal.
B
MCQ 91 Mark
Which type of image is formed by a convex mirror?
- AReal, inverted and diminished
- ✓Virtual, erect and diminished
- CReal, inverted and enlarged
- DVirtual, erect and enlarged
Answer
View full question & answer→Correct option: B.
Virtual, erect and diminished
B
MCQ 101 Mark
Which type of image cannot be obtained by a concave mirror?
- AReal and enlarged
- BReal and diminished
- CVirtual and enlarged
- ✓Virtual and diminished
Answer
View full question & answer→Correct option: D.
Virtual and diminished
D
MCQ 111 Mark
Where should the object be placed to obtain a real and magnified image using a concave mirror?
- ABetween the pole and the principal focus of the mirror
- BAt the principal focus of the mirror
- ✓Between the principal focus and the centre of curvature of the mirror
- DAt the centre of curvature of the mirror
Answer
View full question & answer→Correct option: C.
Between the principal focus and the centre of curvature of the mirror
C
MCQ 121 Mark
Where should the object be placed to obtain a real and diminished image using a concave mirror?
- ABetween the principal focus and the pole of the mirror
- BAt the centre of curvature of the mirror
- CBetween the principal focus and the centre of curvature of the mirror
- ✓Beyond the centre of curvature of the mirror
Answer
View full question & answer→Correct option: D.
Beyond the centre of curvature of the mirror
D
MCQ 131 Mark
Where should the object be placed to obtain its real image of the same size as the object using a concave mirror?
- AAt infinite distance from the mirror
- ✓At the centre of curvature of the mirror
- CAt the principal focus of the mirror
- DBetween the principal focus and the centre of curvature of the mirror
Answer
View full question & answer→Correct option: B.
At the centre of curvature of the mirror
B
MCQ 141 Mark
What is the diameter of the reflecting circular surface of a spherical mirror called?
- ✓Aperture
- BRadius of curvature
- CFocal length
- DPrincipal axis
Answer
View full question & answer→Correct option: A.
Aperture
A
MCQ 151 Mark
What is the centre of a spherical mirror called?
- APrincipal focus
- BCentre of curvature
- CPrincipal axis
- ✓Pole
Answer
View full question & answer→Correct option: D.
Pole
D
MCQ 161 Mark
An object placed in front of a convex mirror is moved from far-off distance towards the pole of the mirror. Then the image…
- ✓moves towards the pole.
- Bmoves away from the pole.
- Cfirst moves away from the pole and then towards the pole.
- Dfirst moves towards the pole and then away from the pole.
Answer
View full question & answer→Correct option: A.
moves towards the pole.
A
MCQ 171 Mark
An object placed in front of a convex mirror Is moved from far-off distance towards the pole of the mirror. Then size of the image…
- ✓increases
- Bdecreases
- Cremains constant.
- Dfirst increases and then decreases
Answer
View full question & answer→Correct option: A.
increases
A
MCQ 181 Mark
The absolute refractive indices of three substances A, B and C are 1.33, 1.65 and 1.46 respectively. In which substance is the speed of light maximum?
- ✓A
- BB
- CC
- DWould be the same in A, B and C
Answer
View full question & answer→Correct option: A.
A
(A) A
Hint : $n_{ m }=\frac{c}{v}$
Hint : $n_{ m }=\frac{c}{v}$
MCQ 191 Mark
Magnification produced by a rear-view mirror fitted in vehicles…
- ✓is always less than 1.
- Bis always equal to 1.
- Cis always more than 1.
- Dcan be more than or less than 1 depending upon the position of the object in front of the mirror.
Answer
View full question & answer→Correct option: A.
is always less than 1.
(A) is always less than 1.
Hint: Convex mirror is used as rear-view mirror in vehicles. Image formed by it is always virtual, erect and diminished in size compared to the object. So, magnification of image formed by it is less than 1.
Hint: Convex mirror is used as rear-view mirror in vehicles. Image formed by it is always virtual, erect and diminished in size compared to the object. So, magnification of image formed by it is less than 1.
MCQ 201 Mark
As shown in the following figure, a light ray travels from medium A to medium B. Then refractive index of medium A relative to medium B would be _______.
- A$>1$
- ✓$<1$
- C$=1$
- D$=0$
Answer
View full question & answer→Correct option: B.
$<1$
B
MCQ 211 Mark
As shown in the following figure, a light ray travels from medium A to medium B. Then refractive index of medium B relative to medium A would be...
- ✓$\frac{\sqrt{3}}{\sqrt{2}}$
- B$\frac{\sqrt{2}}{\sqrt{3}}$
- C$\frac{1}{\sqrt{2}}$
- D$\sqrt{2}$
Answer
View full question & answer→Correct option: A.
$\frac{\sqrt{3}}{\sqrt{2}}$
A
MCQ 221 Mark
A ray of light travelling in air is obliquely incident on undisturbed horizontal surface of pond water. Inside the water, it…
- Awill travel without deviation.
- Bwill bend away from the normal drawn at the point of incidence.
- ✓will bend towards the normal drawn at the point of incidence.
- Dwill turn back following the original path.
Answer
View full question & answer→Correct option: C.
will bend towards the normal drawn at the point of incidence.
C
MCQ 231 Mark
An object is kept at the centre of curvature of a concave mirror. The distance between the image of the object and pole of the mirror…
- Awould be equal to f.
- Bwould be less than 2f but more than f.
- ✓would be equal to 2f
- Dwould be more than 2f.
Answer
View full question & answer→Correct option: C.
would be equal to 2f
C
MCQ 241 Mark
A virtual image of an object is formed by a mirror, then…
- Ait would be a convex mirror.
- Bit would be a concave mirror.
- Cit would be a plane mirror.
- ✓it would be any one of the mirrors given above.
Answer
View full question & answer→Correct option: D.
it would be any one of the mirrors given above.
D
MCQ 251 Mark
What is the angle of refraction for a light ray incident normal to the surface of a medium?
- A$90^{\circ} $
- B$60^{\circ} $
- C$30^{\circ} $
- ✓$0^{\circ} $
Answer
View full question & answer→Correct option: D.
$0^{\circ} $
(D) $0^{\circ} $
Hint : According to general form of Snell's law $n_1 \sin i=n_2 \sin r$. As $i=0^{\circ}$, then $r=0^{\circ}$ because value of $n_1$ and $n_2$ are never zero.
Hint : According to general form of Snell's law $n_1 \sin i=n_2 \sin r$. As $i=0^{\circ}$, then $r=0^{\circ}$ because value of $n_1$ and $n_2$ are never zero.
MCQ 261 Mark
Which of the following always form virtual image?
- AConcave mirror and convex lens
- ✓Convex mirror and concave lens
- CConvex mirror and convex lens
- DConcave mirror and concave lens
Answer
View full question & answer→Correct option: B.
Convex mirror and concave lens
B
MCQ 271 Mark
The absolute refractive indices of water, glass and diamond are 1.33, 1.50 and 2.42 respectively. Which medium has maximum optical density?
- AWater
- BGlass
- ✓Diamond
- DData not enough to draw any conclusion
Answer
View full question & answer→Correct option: C.
Diamond
(C) Diamond
Hint: The greater the absolute refractive index, the greater is the optical density.
Hint: The greater the absolute refractive index, the greater is the optical density.
MCQ 281 Mark
If the absolute refractive indices of water and glass are $\frac{4}{3}$ and $\frac{3}{2}$ respectively, then what is the ratio of the speed of light in water to that in glass?
- A$2$
- B$\frac{8}{9}$
- ✓$\frac{9}{8}$
- D$\frac{1}{2}$
Answer
View full question & answer→Correct option: C.
$\frac{9}{8}$
(C) $\frac{9}{8}$
Hint: Taking water as medium 1 and glass as medium 2, speed of light in water would be v1 and speed of light in glass would be v2.
Here, $n_1=\frac{4}{3}$ and $n_2=\frac{3}{2}$
Now, $n_{21}=\frac{n_2}{n_1}=\frac{v_1}{v_2}$
$\therefore \frac{3 / 2}{4 / 3}=\frac{v_1}{v_2} \quad \therefore \frac{v_1}{v_2}=\frac{9}{8}$
Hint: Taking water as medium 1 and glass as medium 2, speed of light in water would be v1 and speed of light in glass would be v2.
Here, $n_1=\frac{4}{3}$ and $n_2=\frac{3}{2}$
Now, $n_{21}=\frac{n_2}{n_1}=\frac{v_1}{v_2}$
$\therefore \frac{3 / 2}{4 / 3}=\frac{v_1}{v_2} \quad \therefore \frac{v_1}{v_2}=\frac{9}{8}$
MCQ 291 Mark
Which type of image is formed by a plane mirror?
- AReal and inverted
- BReal and erect
- ✓Virtual and erect
- DVirtual and inverted
Answer
View full question & answer→Correct option: C.
Virtual and erect
C
MCQ 301 Mark
If the absolute refractive indices of water, benzene and sapphire are 1.33, 1.50 and 1.77 respectively, then which medium has maximum relative refractive Index?
- ✓Sapphire relative to water
- BSapphire relative to benzene
- CBenzene relative to water
- DWater relative to benzene
Answer
View full question & answer→Correct option: A.
Sapphire relative to water
(A) Sapphire relative to benzene
Hint :
$n_{21}=\frac{n_2}{n_1}$
$\therefore n_{21}$ is maximum, when $n_2$ is maximum and $n_1$ is minimum.
Hence, it is obvious that in the present case, medium 1 must be water and medium 2 must be sapphire.
$\therefore$ Refractive index of sapphire with respect to water would be maximum.
Hint :
$n_{21}=\frac{n_2}{n_1}$
$\therefore n_{21}$ is maximum, when $n_2$ is maximum and $n_1$ is minimum.
Hence, it is obvious that in the present case, medium 1 must be water and medium 2 must be sapphire.
$\therefore$ Refractive index of sapphire with respect to water would be maximum.
MCQ 311 Mark
What is the focal length of a convex lens having power $+ 5.0$ D?
- A$-10 cm$
- B$-20 cm$
- C$+ 10 cm$
- ✓$+ 20 cm$
Answer
View full question & answer→Correct option: D.
$+ 20 cm$
(D) $+ 20 cm$
Hint : $P=\frac{1}{f}$
$\therefore f=\frac{1}{ p }=\frac{1}{5}=0.2 m=+20 cm$
Hint : $P=\frac{1}{f}$
$\therefore f=\frac{1}{ p }=\frac{1}{5}=0.2 m=+20 cm$
MCQ 321 Mark
Which of the lenses with focal length 10 cm, 20 cm, 25 cm and 50 cm has maximum power?
- A50 cm
- B25 cm
- C20 cm
- ✓10 cm
Answer
View full question & answer→Correct option: D.
10 cm
(D) 10 cm
Hint : From power $P=\frac{1}{f}$, the lens with less focal length $f$ has more power $P$. So, the lens with focal length 10 cm has maximum power.
Hint : From power $P=\frac{1}{f}$, the lens with less focal length $f$ has more power $P$. So, the lens with focal length 10 cm has maximum power.
MCQ 331 Mark
The absolute refractive index of any medium is ________.
- A$1$
- ✓$>1$
- C$<1$
- Dzero
Answer
View full question & answer→Correct option: B.
$>1$
B
MCQ 341 Mark
Which of the following materials has maximum optical density?
- AGlass
- BWater
- CCarbon disulphide
- ✓Diamond
Answer
View full question & answer→Correct option: D.
Diamond
(D) Diamond
Hint: From the given substances, diamond has highest refractive index.
Hint: From the given substances, diamond has highest refractive index.
MCQ 351 Mark
Where should an object be placed to obtain its image as real, inverted and of the same height as the object by a convex lens?
- AAt the principal focus
- BBetween the principal focus and centre of curvature
- ✓At the centre of curvature
- DBetween the optical centre and principal focus
Answer
View full question & answer→Correct option: C.
At the centre of curvature
C
MCQ 361 Mark
The distance between the object at 40 cm from a plane mirror and its image is ______.
- A40 cm
- ✓80 cm
- C20 cm
- D60 cm
Answer
View full question & answer→Correct option: B.
80 cm
(B) 80 cm
Hint: The distance between the object and its image $=|u|+|v|$
$\begin{array}{l}=40+40 \quad(\because \text { Here, }|u|=|v|) \\ =80 cm\end{array}$
Hint: The distance between the object and its image $=|u|+|v|$
$\begin{array}{l}=40+40 \quad(\because \text { Here, }|u|=|v|) \\ =80 cm\end{array}$
MCQ 371 Mark
The focal length of a plane mirror is ______.
- Azero
- ✓infinity
- Cequal to half the object distance
- Dequal to the object distance
Answer
View full question & answer→Correct option: B.
infinity
(B) infinity
Hint : In case of plane mirror $|v|=|u|$, also according to the New Cartesian sign convention, $v$ is positive and $u$ is negative.
Now, from the mirror formula $\frac{1}{f}=\frac{1}{u}+\frac{1}{v},$ for a plane mirror, as $|v|=|u|$ and $u$ is negative while $v$ is positive, we get $\frac{1}{f}=0 \quad \therefore f=\infty$ (infinity)
Hint : In case of plane mirror $|v|=|u|$, also according to the New Cartesian sign convention, $v$ is positive and $u$ is negative.
Now, from the mirror formula $\frac{1}{f}=\frac{1}{u}+\frac{1}{v},$ for a plane mirror, as $|v|=|u|$ and $u$ is negative while $v$ is positive, we get $\frac{1}{f}=0 \quad \therefore f=\infty$ (infinity)
MCQ 381 Mark
The magnífication produced by a plane mirror is always ______.
- Amore than 1
- ✓1
- Cless than 1
- Dzero
Answer
View full question & answer→Correct option: B.
1
(B) 1
$\begin{array}{l}\text {Hint :}\quad m=\frac{h^{\prime}}{h}=1 \quad\left(\because \text { Here, } h^{\prime}=h\right)\\\text {or} \\ m=-\frac{v}{u} \\ \end{array} $
Here, $|v|=|u|$ and $u$ is negative while $v$ is positive.
$\therefore$ We get, $m=1$
$\begin{array}{l}\text {Hint :}\quad m=\frac{h^{\prime}}{h}=1 \quad\left(\because \text { Here, } h^{\prime}=h\right)\\\text {or} \\ m=-\frac{v}{u} \\ \end{array} $
Here, $|v|=|u|$ and $u$ is negative while $v$ is positive.
$\therefore$ We get, $m=1$
MCQ 391 Mark
Where, in front of a concave mirror, should an object be placed to get its virtual and erect image?
- AAt principal focus F
- BAt centre of curvature C
- ✓Between the principal focus and the pole
- DBeyond the centre of curvature
Answer
View full question & answer→Correct option: C.
Between the principal focus and the pole
C
MCQ 401 Mark
Through which of the following points, will a ray passing through the centre of curvature (C) and reflected by a concave mirror pass?
- AFocus
- ✓Centre of curvature
- CPole
- DAll
Answer
View full question & answer→Correct option: B.
Centre of curvature
B
MCQ 411 Mark
What is the relation between the radius of curvature $(R)$ and the focal length $(f)$ of a spherical mirror?
- A$R = f / 2$
- B$R = f$
- ✓$R = 2f$
- D$R = 3f$
Answer
View full question & answer→Correct option: C.
$R = 2f$
C
MCQ 421 Mark
What is the wavelength range of visible light?
- ✓$4 \times 10^{-7} m$ to $8 \times 10^{-7} m$
- B$4 \times 10^{-9} m$ to $8 \times 10^{-9} m$
- C$4 \times 10^{-5} m$ to $8 \times 10^{-5} m$
- D$4 \times 10^{-6} m$ to $8 \times 10^{-6} m$
Answer
View full question & answer→Correct option: A.
$4 \times 10^{-7} m$ to $8 \times 10^{-7} m$
A
MCQ 431 Mark
The magnifying power of convex lens is ______.
- A$>1$
- B$<1$
- C$=1$
- Dcannot be determined
Answer
View full question & answer→A, B and C
MCQ 441 Mark
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
- AA convex lens of focal length 50 cm
- BA concave lens of focal length 50 cm
- ✓A convex lens of focal length 5 cm
- DA concave lens of focal length 5 cm
Answer
View full question & answer→Correct option: C.
A convex lens of focal length 5 cm
(C) A convex lens of focal length 5 cm
[Hint: Since a convex lens gives a magnified image of the object and the smaller the focal length, the more the magnifying power.]
[Hint: Since a convex lens gives a magnified image of the object and the smaller the focal length, the more the magnifying power.]
MCQ 451 Mark
No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be
- Aonly plane
- Bonly concave.
- Conly convex
- ✓either plane or convex.
Answer
View full question & answer→Correct option: D.
either plane or convex.
(D) either plane or convex. [Hint: Both give erect images. The size of image in plane mirror is same as the object but it is diminished in convex mirror.]
MCQ 461 Mark
A spherical mirror and a thin spherical lens have each a focal length of 15 cm. The mirror and the lens are likely to be…
- ✓both concave.
- Bboth convex.
- Cthe mirror is concave and the lens is convex.
- Dthe mirror is convex, but the lens is concave
Answer
View full question & answer→Correct option: A.
both concave.
A
MCQ 471 Mark
Where should an object be placed in front of a convex lens to get a real image of the size of the object?
- AAt the principal focus of the lens
- ✓At twice the focal length of the lens
- CAt infinity
- DBetween the optical centre of the lens and its principal focus
Answer
View full question & answer→Correct option: B.
At twice the focal length of the lens
B
MCQ 481 Mark
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
- ABetween the principal focus and the centre of curvature
- BAt the centre of curvature
- CBeyond the centre of curvature
- ✓Between the pole of the mirror and its principal focus
Answer
View full question & answer→Correct option: D.
Between the pole of the mirror and its principal focus
D
MCQ 491 Mark
Which one of the following materials cannot be used to make a lens?
- AWater
- BGlass
- CPlastic
- ✓Clay
Answer
View full question & answer→Correct option: D.
Clay
(D) Clay
[Hint: The material of a lens must be transparent but clay is opaque]
[Hint: The material of a lens must be transparent but clay is opaque]