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MCQOPTIONS
This section includes 1489 Mcqs, each offering curated multiple-choice questions to sharpen your 8th Class knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
The image formed by a convex mirror of real object is larger than the object. |
| A. | When u < 2f |
| B. | When u > 2f |
| C. | for all values ofu |
| D. | for no value of u |
| Answer» E. | |
| 552. |
Statement I: A concave mirror has a real focus. Statement II: A convex mirror has a virtual focus. |
| A. | Both Statements are true. Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true. Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true. Statement-II is false. |
| D. | Statement-I is false. Statement-II is true. |
| Answer» C. Statement-I is true. Statement-II is false. | |
| 553. |
In the above problem, find the position of lower edge of the mirror relative to the ground is |
| A. | 160 cm |
| B. | 75 cm |
| C. | 100 cm |
| D. | 200 cm |
| Answer» D. 200 cm | |
| 554. |
A lady dressed in a new sari stands in front of a plane mirror fixed on a vertical wall, height of the lady is 160 cm and that of her eyes from the ground is 150 cm, then find the position of upper edge of the mirror relative to the ground is |
| A. | 155 cm |
| B. | 160 cm |
| C. | 100 cm |
| D. | 200 cm |
| Answer» B. 160 cm | |
| 555. |
A lady dressed in a new sari stands in front of a plane mirror fixed on a vertical wall, height of the lady is 160 cm and that of her eyes from the ground is 150 cm, then The length of the mirror required to see her fall view in the mirror is |
| A. | 160 cm |
| B. | 100 cm |
| C. | 80 cm |
| D. | 320 cm |
| Answer» D. 320 cm | |
| 556. |
You are standing in front of a plane mirror, which is approaching you with a speed of 10cm/sec. Then the speed of the image approaching you will be |
| A. | 20 cm/s |
| B. | 10 cm/s |
| C. | 15 cm/s |
| D. | 25 cm/s |
| Answer» B. 10 cm/s | |
| 557. |
Shyam views a certain object and finds that it is not properly visible to him. The image of the said object is formed by his eye lens 3 cm away from the pupil of his eye.Shyam can correct the defect in his vision by using |
| A. | convex lens |
| B. | bifocal lens |
| C. | concave lens |
| D. | cylindrical lens |
| Answer» B. bifocal lens | |
| 558. |
Myopia is a defect of vision caused by |
| A. | a decrease in the retinal distance from the lens |
| B. | a decrease in the diameter of the eyeball |
| C. | an increase in the thickness of the lens |
| D. | an increase in the curvature of the lens |
| Answer» E. | |
| 559. |
The range of vision of a normal human eye lies between |
| A. | 25 m and infinity |
| B. | 2.5 m and 5 km |
| C. | 2.5 cm and 5 km |
| D. | 25 cm and infinity |
| Answer» E. | |
| 560. |
When the rays of light, diverging from a point, after reflection or refraction actually converge at some other point then that point is ___ image of the object |
| A. | Virtual |
| B. | Real |
| C. | Both (a) and (b) |
| D. | Neither (a) nor (b) |
| Answer» C. Both (a) and (b) | |
| 561. |
Tina has a defect in her eyes. She is not able to contract her iris properly. As a result of the defect in her eyes, Tina will not be able to see |
| A. | in dim light |
| B. | near objects |
| C. | in bright light |
| D. | distant objects |
| Answer» B. near objects | |
| 562. |
Which of the following pairs of eye parts is responsible for controlling the amount of light entering into the eye? |
| A. | Iris and pupil |
| B. | Cornea and eye lens |
| C. | Cilliary muscles and iris |
| D. | Cilliary muscles and pupil |
| Answer» B. Cornea and eye lens | |
| 563. |
When we look at a distant object, the ciliary muscles__i__, making the eye lens __ii__. This iii the focal length of the eye lens so that the image of that object gets focused on the retina. The information in which alternative completes the given statements? |
| A. | i-get released, ii-thicker, iii-decreases |
| B. | i-contract, ii-thicker, iii-increases |
| C. | i-get released, ii-thinner, iii-increses |
| D. | i-contract, ii-thinner, iii-decreases |
| Answer» D. i-contract, ii-thinner, iii-decreases | |
| 564. |
Four statements about the blind spot of the human eye: I It is devoid of photosensitive cells. II No image is formed at the blind spot. III It connects the optic nerves to the retina. IV Its malfunctioning makes a person blind. Which of the given statements is incorrect? |
| A. | I |
| B. | II |
| C. | III |
| D. | IV |
| Answer» E. | |
| 565. |
The given diagram is that of the human eye. In the given diagram, the parts labelled as I and II are respectively the |
| A. | eye lens and the cornea |
| B. | pupil and the eye lens |
| C. | cornea and the pupil |
| D. | pupil and the iris |
| Answer» C. cornea and the pupil | |
| 566. |
The primary function of the crystalline lens in the human eye is to |
| A. | reduce the intensity of light |
| B. | focus the incident light rays |
| C. | adjust the size of the pupil |
| D. | filter out the dust particles |
| Answer» C. adjust the size of the pupil | |
| 567. |
The focal length of the eye lens is adjusted by the |
| A. | vitreous humour |
| B. | aqueous humour |
| C. | ciliary muscles |
| D. | optic nerves |
| Answer» D. optic nerves | |
| 568. |
Which of the following parts of the eye has enormous number of photo-sensitive cells? |
| A. | Iris |
| B. | Pupil |
| C. | Retina |
| D. | Cornea |
| Answer» D. Cornea | |
| 569. |
When the rays of light, diverging from a point, after reflection or refraction, appear to diverge from another point, then the image so formed is called |
| A. | Virtual image |
| B. | Real image |
| C. | Both (a) and (b) |
| D. | Neither (a) nor (b) |
| Answer» C. Both (a) and (b) | |
| 570. |
A fish is raising vertically to the surface of water in a lake uniformly at the rate of \[2m{{s}^{-1}}\] observes a bird diving vertically towards the water at a rate \[4m{{s}^{-1}}\] vertically above it. The refractive index of water is 4/3. The actual velocity of the bird is |
| A. | 3/2 |
| B. | 2/3 |
| C. | 4/3 |
| D. | 3/4 |
| Answer» B. 2/3 | |
| 571. |
The velocity of light in air is \[3\times {{10}^{8}}m{{s}^{-1}}\] and in glass is \[2\times 108m{{s}^{-1}}\].. The refractive index of glass w.r.t air is |
| A. | 2/3 |
| B. | 3/2 |
| C. | 4/3 |
| D. | 9/4 |
| Answer» B. 3/2 | |
| 572. |
When a light ray passes from one medium \[({{\mu }_{1}})\] to other medium \[({{\mu }_{2}})\]. Refraction does not take place in the following situation. |
| A. | for normal incidence |
| B. | \[{{\mu }_{1}}>{{\mu }_{2}}\] |
| C. | \[{{\mu }_{1}}={{\mu }_{2}}\] |
| D. | \[{{\mu }_{1}}<{{\mu }_{2}}\] |
| Answer» B. \[{{\mu }_{1}}>{{\mu }_{2}}\] | |
| 573. |
Light of the wave length \[7200{{A}^{o}}\] in air has a wave length in glass is equal to (\[\mu =1.5\]) |
| A. | \[7200\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| B. | \[4800\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| C. | \[1080\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| D. | \[3600\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| Answer» C. \[1080\overset{\text{o}}{\mathop{\text{A}}}\,\] | |
| 574. |
Light starting from a medium of refractive index \[\mu \] undergoes refraction into a medium \[{{\mu }^{\text{l}}}\] If i and r stand for angles of incidence and refraction respectively, then |
| A. | \[\frac{\sin i}{\sin r}=\frac{\mu }{{{\mu }^{\text{l}}}}\] |
| B. | \[\frac{\sin i}{\sin r}=\frac{{{\mu }^{\text{l}}}}{\mu }\] |
| C. | \[\frac{\cos i}{\cos r}=\frac{{{\mu }^{\text{l}}}}{\mu }\] |
| D. | \[\frac{sini}{sinr}=\frac{1}{\mu {{\mu }^{\text{l}}}}\] |
| Answer» C. \[\frac{\cos i}{\cos r}=\frac{{{\mu }^{\text{l}}}}{\mu }\] | |
| 575. |
The property that which a light a ray passes obliquely from one medium into another it bends at interface is |
| A. | Reflection |
| B. | Refraction |
| C. | Interference |
| D. | Polarization |
| Answer» B. Refraction | |
| 576. |
Statement I: The radius of curvature and focal length of convex mirror are 80 cm and 40 cm Statement II: The relation between radius of curvature and focal length is R = 2f. |
| A. | Both Statements are true, Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true, Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true. Statement-II is false. |
| D. | Statement-I is false. Statement-II is true. |
| Answer» B. Both Statements are true, Statement-II is not correct explanation of Statement-I. | |
| 577. |
When a mirror is rotated through an angle 9 the reflected ray from it, turns through an angle of |
| A. | \[\theta \] |
| B. | \[\frac{\theta }{2}\] |
| C. | \[2\theta \] |
| D. | 0 |
| Answer» D. 0 | |
| 578. |
Statement I: All the light rays actually converge at some point Statement II: All the light rays appears to converge at some point |
| A. | Both Statements are true. Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true, Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true, Statement-II is false. |
| D. | Statement-I is false, Statement-II is true. |
| Answer» E. | |
| 579. |
If a mirror is rotated by \[{{10}^{o}}\], the reflected ray is rotated by |
| A. | \[{{10}^{o}}\] |
| B. | \[{{20}^{o}}\] |
| C. | \[{{40}^{o}}\] |
| D. | \[{{30}^{o}}\] |
| Answer» C. \[{{40}^{o}}\] | |
| 580. |
Image of our face in a plane mirror |
| A. | Is a virtual image |
| B. | Is a real image |
| C. | Cannot be taken on the screen |
| D. | Both (b) and (c) |
| Answer» B. Is a real image | |
| 581. |
Consider three statements regarding the defects of eye .I. If the size of the eye ball decreases, then the person suffers from myopia .II. If the near point of eye becomes greater than 25 cm, then the person is said to suffer from hypermetropia .III. A person, at older age, suffering from presbyopia uses a bifocal lens for correction. Among the given statements, |
| A. | only statement I is correct |
| B. | only statement II is correct |
| C. | both statements I and II are correct |
| D. | both statements II and III are correct |
| Answer» E. | |
| 582. |
The image formed by the eye lens on the retina is |
| A. | real, inverted, and large |
| B. | virtual, erect, and large |
| C. | real, inverted, and diminished |
| D. | virtual, erect, and diminished |
| Answer» D. virtual, erect, and diminished | |
| 583. |
In the human eye, light is converted into electrical signals by the |
| A. | retina |
| B. | cornea |
| C. | blind spot |
| D. | optical nerves |
| Answer» B. cornea | |
| 584. |
The ciliary muscles of the human eye contract and relax in order to |
| A. | adjust the size of the eyeball |
| B. | adjust the focal length of the lens |
| C. | control the amount of light entering the eye |
| D. | prevent foreign elements from entering the eye |
| Answer» C. control the amount of light entering the eye | |
| 585. |
Which part of the human eye contracts and relaxes 2 in order to adjust the focal length of the lens? |
| A. | Iris |
| B. | Pupil |
| C. | Blind spot |
| D. | Ciliary muscles |
| Answer» E. | |
| 586. |
Which of the following eye parts is not in contact with the eye lens? |
| A. | Vitreous humour |
| B. | Ciliary fibres |
| C. | Cornea |
| D. | Iris |
| Answer» D. Iris | |
| 587. |
A thin lens produces an image of the same size as the object. Then from the optical centre of the lens, the distance of the object is |
| A. | Zero |
| B. | 4 f |
| C. | 2 f |
| D. | f/2 |
| Answer» D. f/2 | |
| 588. |
Motion and still pictures projected in a cinema hall are ____ images |
| A. | Real |
| B. | (b) Virtual |
| C. | Erect |
| D. | All of these |
| Answer» B. (b) Virtual | |
| 589. |
In case of convex lens, as object is coming closer to the lens the image will ___ |
| A. | Move away from lens |
| B. | Move towards the lens |
| C. | Move up |
| D. | Not move |
| Answer» B. Move towards the lens | |
| 590. |
A convergent lens of focal length 20 cm and made of a material with refractive index 1.1 is immersed in water the lens behaves as a |
| A. | Converging lens of focal length 20 cm |
| B. | Converging lens of focal length less than 20 cm |
| C. | Converging lens of focal length more than 20 cm |
| D. | Diverging lens |
| Answer» E. | |
| 591. |
A simple magnifying glass consists of a |
| A. | Convex lens |
| B. | A concave lens |
| C. | Convex lens of small focal length |
| D. | Convex lens of large focal length |
| Answer» D. Convex lens of large focal length | |
| 592. |
A layered lens as shown in the figure is made of two materials indicated by different shades. A point object is placed on its axis. The lens will form. |
| A. | One image |
| B. | Two images |
| C. | Five images |
| D. | Three images |
| Answer» C. Five images | |
| 593. |
The graph drawn with object distance along x- coordinate and image (real) distance as y- coordinate for a convex is a |
| A. | Straight line |
| B. | Circle |
| C. | Parabola |
| D. | Rectangular hyperbola |
| Answer» E. | |
| 594. |
A double convex air bubble in water would behave as a |
| A. | Convergent lens |
| B. | Circle |
| C. | Divergent lens |
| D. | Pane mirror |
| Answer» D. Pane mirror | |
| 595. |
In the figure, A point source P is placed at a height 4 m above the plane mirror in a medium of refractive index 1.2 an observer 0 vertically above P, outside the liquid sees P and its image in the mirror. The apparent distance between these two is _____cm |
| A. | 3.3 cm |
| B. | 6.6 cm |
| C. | 9.9 cm |
| D. | 13.2 cm |
| Answer» D. 13.2 cm | |
| 596. |
Statement I: When light travels from one medium to another, then frequency remains constant. Statement II: When the direction of light ray is reversed, the ray simply retraces its path, this statement is called the Principle of reversibility of light. |
| A. | Both Statements are true. Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true, Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true, Statement-II is false. |
| D. | Statement-I is false. Statement-II is true. |
| Answer» C. Statement-I is true, Statement-II is false. | |
| 597. |
Statement I: When a light ray from rarer medium is refracted into denser medium its velocity decreases and wavelength decreases Statement II: Refractive index decreases with increases in temperature. |
| A. | Both Statements are true. Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true. Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true, Statement-II is false. |
| D. | Statement-I is false. Statement-II is true. |
| Answer» C. Statement-I is true, Statement-II is false. | |
| 598. |
If refractive indices of glass and water are respectively \[{}^{3}/{}_{2}\] and \[{}^{4}/{}_{3}\], then the refractive index of glass with respective to water is |
| A. | 2 |
| B. | \[{}^{8}/{}_{9}\] |
| C. | \[{}^{9}/{}_{8}\] |
| D. | \[{}^{1}/{}_{2}\] |
| Answer» D. \[{}^{1}/{}_{2}\] | |
| 599. |
The part of light which is returned back into the same medium is called |
| A. | Reflected light |
| B. | Refracted light |
| C. | Both (a) and (b) |
| D. | Neither (a) nor (b) |
| Answer» B. Refracted light | |
| 600. |
If the speed of red light is denoted by \[{{V}_{r}}\], and the speed for violet light by \[{{V}_{v}}\]. Then in vacuum. |
| A. | \[{{V}_{r}}>{{V}_{v}}\] |
| B. | \[{{V}_{r}}={{V}_{v}}\] |
| C. | \[{{V}_{r}}<{{V}_{v}}\] |
| D. | both 1 & 3 |
| Answer» C. \[{{V}_{r}}<{{V}_{v}}\] | |