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MCQOPTIONS
This section includes 54 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following graphs shows appropriate variation of refractive index m with wavelength l |
| A. | |
| B. | |
| C. | \[{{T}_{1}}>{{T}_{2}}>{{T}_{3}}\] |
| Answer» B. | |
| 2. |
When light is incident on a medium at angle i and refracted into a second medium at an angle r, the graph of sin i vs sinr is as shown in the graph. From this, one can conclude that |
| A. | Velocity of light in the second medium is 1.73 times the velocity of light in the I medium |
| B. | Velocity of light in the medium is 1.73 times the velocity in the II medium |
| C. | 7.5 m mho |
| D. | sin \[{{i}_{c}}=\frac{1}{2}\] |
| Answer» C. 7.5 m mho | |
| 3. |
The graph between sine of angle of refraction (sin r) in medium 2 and sine of angle of incidence (sin i) in medium 1 indicates that (tan 36° » \[\frac{3}{4}\]) |
| A. | Total internal reflection can take place |
| B. | Total internal reflection cannot take place |
| C. | A NOR gate |
| D. | Data is incomplete |
| Answer» C. A NOR gate | |
| 4. |
For a small angled prism, angle of prism A, the angle of minimum deviation (d) varies with the refractive index of the prism as shown in the graph |
| A. | Point P corresponds to m = 1 |
| B. | Slope of the line PQ = A/2 |
| C. | NOR |
| D. | None of the above statements is true |
| Answer» D. None of the above statements is true | |
| 5. |
Three right angled prisms of refractive indices \[{{n}_{1}},{{n}_{2}}\] and \[{{n}_{3}}\] are fixed together using an optical glue as shown in figure. If a ray passes through the prisms without suffering any deviation, then |
| A. | \[{{n}_{1}}={{n}_{2}}={{n}_{3}}\] |
| B. | \[{{n}_{1}}={{n}_{2}}\ne {{n}_{3}}\] |
| C. | A metal at \[0K\] is finite |
| D. | \[1+n_{2}^{2}=n_{1}^{2}+n_{3}^{2}\] |
| Answer» E. | |
| 6. |
A double convex lens, lens made of a material of refractive index \[{{\mu }_{1}}\], is placed inside two liquids or refractive indices \[{{\mu }_{2}}\] and \[{{\mu }_{3}}\], as shown. \[{{\mu }_{2}}>{{\mu }_{1}}>{{\mu }_{3}}\]. A wide, parallel beam of light is incident on the lens from the left. The lens will give rise to |
| A. | A single convergent beam |
| B. | Two different convergent beams |
| C. | 20, 6 kW, 16.7 m mho |
| D. | A convergent and a divergent beam |
| Answer» E. | |
| 7. |
The slab of a material of refractive index 2 shown in figure has curved surface APB of radius of curvature 10 cm and a plane surface CD. On the left of APB is air and on the right of CD is water with refractive indices as given in figure. An object O is placed at a distance of 15 cm from pole P as shown. The distance of the final image of O from P, as viewed from the left is |
| A. | 20 cm |
| B. | 30 cm |
| C. | \[W+(X\cdot Y)\] |
| D. | 50 cm |
| Answer» C. \[W+(X\cdot Y)\] | |
| 8. |
A beaker containing liquid is placed on a table, underneath a microscope which can be moved along a vertical scale. The microscope is focussed, through the liquid onto a mark on the table when the reading on the scale is a. It is next focussed on the upper surface of the liquid and the reading is b. More liquid is added and the observations are repeated, the corresponding readings are c and d. The refractive index of the liquid is |
| A. | \[\frac{d-b}{d-c-b+a}\] |
| B. | \[\frac{b-d}{d-c-b+a}\] |
| C. | If assertion is true but reason is false. |
| D. | \[\frac{d-b}{a+b-c-d}\] |
| Answer» B. \[\frac{b-d}{d-c-b+a}\] | |
| 9. |
A plano-convex lens when silvered in the plane side behaves like a concave mirror of focal length 30cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 10 cm. Then the refractive index of its material will be [BHU 1997; UPSEAT 1995] |
| A. | 3.0 |
| B. | 2 |
| C. | The critical angle for the two media is given by sin \[{{i}_{c}}=\frac{1}{\sqrt{3}}\] |
| D. | 1.5 |
| Answer» E. | |
| 10. |
A spherical surface of radius of curvature R separates air (refractive index 1.0) from glass (refractive index 1.5). The centre of curvature is in the glass. A point object P placed in air is found to have a real image Q in the glass. The line PQ cuts the surface at a point O, and PO = OQ. The distance PO is equal to [IIT JEE 1998; DPMT 2000] |
| A. | 5 R |
| B. | 3 R |
| C. | 2?1 |
| D. | 1.5 R |
| Answer» B. 3 R | |
| 11. |
A ray of light is incident on the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. If m is the refractive index of the material of the prism, the maximum value of the base angle for which light is totally reflected from the hypotenuse is [EAMCET 2003] |
| A. | \[{{\sin }^{-1}}\left( \frac{1}{\mu } \right)\] |
| B. | \[{{\tan }^{-1}}\left( \frac{1}{\mu } \right)\] |
| C. | Any of (a) and (b) |
| D. | \[{{\cos }^{-1}}\left( \frac{1}{\mu } \right)\] |
| Answer» E. | |
| 12. |
An isosceles prism of angle 120° has a refractive index of 1.44. Two parallel monochromatic rays enter the prism parallel to each other in air as shown. The rays emerging from the opposite faces [IIT-JEE 1995] |
| A. | Are parallel to each other |
| B. | Are diverging |
| C. | Slope = A |
| D. | Make an angle \[2\,\{{{\sin }^{-1}}(0.72)-{{30}^{o}}\}\] with each other |
| Answer» E. | |
| 13. |
The refracting angle of prism is A and refractive index of material of prism is \[\cot \frac{A}{2}\]. The angle of minimum deviation is [CPMT 1992] |
| A. | 180°? 3A |
| B. | 180° + 2A |
| C. | |
| D. | 180° ? 2A |
| Answer» E. | |
| 14. |
An observer can see through a pin?hole the top end of a thin rod of height h, placed as shown in the figure. The beaker height is 3h and its radius h. When the beaker is filled with a liquid up to a height 2h, he can see the lower end of the rod. Then the refractive index of the liquid is [IIT-JEE (Screening) 2002] |
| A. | 5/2 |
| B. | \[\sqrt{(5/2)}\] |
| C. | 13.00 cm |
| D. | 3/2 |
| Answer» C. 13.00 cm | |
| 15. |
Assertion : The cloud in sky generally appear to be whitish. Reason : Diffraction due to cloud is efficient in equal measure at all wavelengths. [AIIMS 2005] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | \[1+{{n}_{1}}={{n}_{2}}+{{n}_{3}}\] |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» D. If the assertion and reason both are false. | |
| 16. |
Assertion : The refractive index of a prism depends only on the kind of glass of which it is made of and the colour of light Reason : The refractive index of a prism depends upon the refracting angle of the prism and the angle of minimum deviation [AIIMS 2000] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | Two different divergent beams |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» D. If the assertion and reason both are false. | |
| 17. |
Assertion : The frequencies of incident, reflected and refracted beam of monochromatic light incident from one medium to another are same Reason : The incident, reflected and refracted rays are coplanar [EAMCET (Engg.) 2000] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 40 cm |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» C. 40 cm | |
| 18. |
Assertion : An empty test tube dipped into water in a beaker appears silver, when viewed from a suitable direction. Reason : Due to refraction of light, the substance in water appears silvery. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | \[\frac{d-c-b+a}{d-b}\] |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» D. If the assertion and reason both are false. | |
| 19. |
Assertion : There is no dispersion of light refracted through a rectangular glass slab. Reason : Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 0.5 m, 0.25 m, 1m |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» C. 0.5 m, 0.25 m, 1m | |
| 20. |
Assertion : Just before setting, the sun may appear to be elliptical. This happens due to refraction. Reason : Refraction of light ray through the atmosphere may cause different magnification in mutually perpendicular directions. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | \[\pi -2C\] |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 21. |
Assertion : The focal length of the mirror is f and distance of the object from the focus is u, the magnification of the mirror is f / u. Reason : Magnification \[=\frac{\text{Size of image}}{\text{Size of object}}\] [AIIMS 1994] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | \[{{\sin }^{-1}}\left( \frac{\mu -1}{\mu } \right)\] |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 22. |
The graph shows how the magnification m produced by a convex thin lens varies with image distance v. What was the focal length of the used [DPMT 1995] |
| A. | \[\frac{b}{c}\] |
| B. | \[\frac{b}{ca}\] |
| C. | - 4 V |
| D. | \[\frac{c}{b}\] |
| Answer» E. | |
| 23. |
The graph shows variation of v with change in u for a mirror. Points plotted above the point P on the curve are for values of v [CPMT 1987] |
| A. | Smaller then f |
| B. | Smaller then 2f |
| C. | A and C |
| D. | Larger than f |
| Answer» D. Larger than f | |
| 24. |
A medium shows relation between i and r as shown. If speed of light in the medium is nc then value of n is |
| A. | 1.5 |
| B. | 2 |
| C. | A NAND gate |
| D. | 3?1/2 |
| Answer» E. | |
| 25. |
The graph between u and v for a convex mirror is |
| A. | |
| B. | |
| C. | 1, 3, 4 |
| Answer» B. | |
| 26. |
As the position of an object (u) reflected from a concave mirror is varied, the position of the image (v) also varies. By letting the u changes from 0 to \[+\infty \] the graph between v versus u will be |
| A. | |
| B. | |
| Answer» B. | |
| 27. |
In a grease spot photometer light from a lamp with dirty chimney is exactly balanced by a point source distance 10 cm from the grease spot. On clearing the chimney, the point source is moved 2 cm to obtain balance again. The percentage of light absorbed by dirty chimney is nearly |
| A. | 0.56 |
| B. | 0.44 |
| C. | 3 |
| D. | 0.64 |
| Answer» D. 0.64 | |
| 28. |
In a compound microscope, the focal length of the objective and the eye lens are 2.5 cm and 5 cm respectively. An object is placed at 3.75 cm before the objective and image is formed at the least distance of distinct vision, then the distance between two lenses will be (i.e. length of the microscopic tube) |
| A. | 11.67 cm |
| B. | 12.67 cm |
| C. | Zero |
| D. | 12.00 cm |
| Answer» B. 12.67 cm | |
| 29. |
The distance between a convex lens and a plane mirror is 10 cm. The parallel rays incident on the convex lens after reflection from the mirror form image at the optical centre of the lens. Focal length of lens will be |
| A. | 10 cm |
| B. | 20 cm |
| C. | 30 |
| D. | Cannot be determined |
| Answer» C. 30 | |
| 30. |
An optical fibre consists of core of m1 surrounded by a cladding of m2 < m1. A beam of light enters from air at an angle a with axis of fibre. The highest a for which ray can be travelled through fibre is |
| A. | \[{{\cos }^{-1}}\sqrt{\mu _{2}^{2}-\mu _{1}^{2}}\] |
| B. | \[{{\sin }^{-1}}\sqrt{\mu _{1}^{2}-\mu _{2}^{2}}\] |
| C. | 30 V |
| D. | \[{{\sec }^{-1}}\sqrt{\mu _{1}^{2}-\mu _{2}^{2}}\] |
| Answer» C. 30 V | |
| 31. |
A fish rising vertically up towards the surface of water with speed 3 ms?1 observes a bird diving vertically down towards it with speed 9 ms?1. The actual velocity of bird is |
| A. | 4.5 ms?1 |
| B. | 5. ms?1 |
| C. | If assertion is true but reason is false. |
| D. | 3.4 ms?1 |
| Answer» B. 5. ms?1 | |
| 32. |
The image of point P when viewed from top of the slabs will be |
| A. | 2.0 cm above P |
| B. | 1.5 cm above P |
| C. | If assertion is true but reason is false. |
| D. | 1 cm above P |
| Answer» E. | |
| 33. |
A small piece of wire bent into an L shape with upright and horizontal portions of equal lengths, is placed with the horizontal portion along the axis of the concave mirror whose radius of curvature is 10 cm. If the bend is 20 cm from the pole of the mirror, then the ratio of the lengths of the images of the upright and horizontal portions of the wire is |
| A. | 1 : 2 |
| B. | 3 : 1 |
| C. | If assertion is true but reason is false. |
| D. | 2 : 1 |
| Answer» C. If assertion is true but reason is false. | |
| 34. |
A cube of side 2 m is placed in front of a concave mirror focal length 1m with its face P at a distance of 3 m and face Q at a distance of 5 m from the mirror. The distance between the images of face P and Q and height of images of P and Q are |
| A. | 1 m, 0.5 m, 0.25 m |
| B. | 0.5 m, 1 m, 0.25 m |
| C. | If assertion is true but reason is false. |
| D. | 0.25 m, 1m, 0.5 m |
| Answer» E. | |
| 35. |
An object is placed infront of a convex mirror at a distance of 50 cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and plane mirror is 30 cm, it is found that there is no parallax between the images formed by two mirrors. Radius of curvature of mirror will be |
| A. | 12.5 cm |
| B. | 25 cm |
| C. | If assertion is true but reason is false. |
| D. | \[18\,cm\] |
| Answer» C. If assertion is true but reason is false. | |
| 36. |
Two point white dots are 1mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which dots can be resolved by the eye ? [Take wavelength of light = 500 nm] [AIEEE 2005] |
| A. | 6 m |
| B. | 3 m |
| C. | If assertion is true but reason is false. |
| D. | 1 m |
| Answer» D. 1 m | |
| 37. |
A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometre from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 Å, is of the order of [CBSE PMT 2004] |
| A. | 0.5 m |
| B. | 5 m |
| C. | |
| D. | 5 cm |
| Answer» D. 5 cm | |
| 38. |
We wish to see inside an atom. Assuming the atom to have a diameter of 100 pm, this means that one must be able to resolved a width of say 10 p.m. If an electron microscope is used, the minimum electron energy required is about [AIIMS 2004] |
| A. | 1.5 KeV |
| B. | 15 KeV |
| C. | \[\frac{bc}{a}\] |
| D. | 1.5 KeV |
| Answer» C. \[\frac{bc}{a}\] | |
| 39. |
A ray of light travels from an optically denser to rarer medium. The critical angle for the two media is C. The maximum possible deviation of the ray will be [KCET (Engg./Med.) 2002] |
| A. | \[\left( \frac{\pi }{2}-C \right)\] |
| B. | 2C |
| C. | Larger then 2f |
| D. | \[\pi -C\] |
| Answer» D. \[\pi -C\] | |
| 40. |
A glass prism \[(\mu \]= 1.5) is dipped in water \[(\mu \]= 4/3) as shown in figure. A light ray is incident normally on the surface AB. It reaches the surface BC after totally reflected, if [IIT JEE 1981; MP PMT 1997] |
| A. | sin\[\theta \] \[\ge \] 8/9 |
| B. | 2/3 < sin\[\theta \]< 8/9 |
| C. | |
| D. | It is not possible |
| Answer» B. 2/3 < sin\[\theta \]< 8/9 | |
| 41. |
A ray of light is incident at the glass?water interface at an angle i, it emerges finally parallel to the surface of water, then the value of \[{{\mu }_{g}}\] would be [IIT-JEE (Screening) 2003] |
| A. | (4/3) sin i |
| B. | 1/sin i |
| C. | 0.36 |
| D. | 1 |
| Answer» C. 0.36 | |
| 42. |
Assertion : Diamond glitters brilliantly. Reason : Diamond does not absorb sunlight. [AIIMS 2005] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 30 cm |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» C. 30 cm | |
| 43. |
Assertion : The speed of light in a rarer medium is greater than that in a denser medium Reason : One light year equals to 9.5 × 1012 km [AIIMS 1999] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 1.3 |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» C. 1.3 | |
| 44. |
Assertion : It is impossible to photograph a virtual image. Reason : The rays which appear diverging from a virtual image fall on the camera and a real image is captured. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | \[{{\tan }^{-1}}\sqrt{\mu _{1}^{2}-\mu _{2}^{2}}\] |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» F. | |
| 45. |
Assertion : Spherical aberration occur in lenses of larger aperture. Reason : The two rays, paraxial and marginal rays focus at different points. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 178o |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 46. |
Assertion : The resolving power of an electron microscope is higher than that of an optical microscope. Reason : The wavelength of electron is more than the wavelength of visible light. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 3.0 ms?1 |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» D. If the assertion and reason both are false. | |
| 47. |
Assertion : Although the surfaces of a goggle lens are curved, it does not have any power. Reason : In case of goggles, both the curved surfaces have equal radii of curvature. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 2.0 cm below P |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 48. |
Assertion : The illuminance of an image produced by a convex lens is greater in the middle and less towards the edges. Reason : The middle part of image is formed by undeflected rays while outer part by inclined rays. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 1 : 3 |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 49. |
Assertion : The focal length of lens does not change when red light is replaced by blue light. Reason : The focal length of lens does not depends on colour of light used. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | \[\frac{50}{3}cm\] |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» E. If assertion is false but reason is true. | |
| 50. |
Assertion : The images formed by total internal reflections are much brighter than those formed by mirrors or lenses. Reason : There is no loss of intensity in total internal reflection. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 5 m |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |