MCQOPTIONS
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MCQOPTIONS
This section includes 12583 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 5351. |
When a telescope is adjusted for parallel light, the distance of the objective from the eye piece is found to be 80 cm. The magnifying power of the telescope is 19. The focal lengths of the lenses are [MP PMT 1992; Very similar to DPMT 2004] |
| A. | 61 cm, 19 cm |
| B. | 40 cm, 40 cm |
| C. | 76 cm, 4 cm |
| D. | 50 cm, 30 cm |
| Answer» D. 50 cm, 30 cm | |
| 5352. |
An opera glass (Gallilean telescope) measures 9 cm from the objective to the eyepiece. The focal length of the objective is 15 cm. Its magnifying power is [DPMT 1988] |
| A. | 2.5 |
| B. | 2/5 |
| C. | 5/3 |
| D. | 0.4 |
| Answer» B. 2/5 | |
| 5353. |
The magnifying power of an astronomical telescope is 8 and the distance between the two lenses is 54 cm. The focal length of eye lens and objective lens will be respectively [MP PMT 1991; CPMT 1991; Pb. PMT 2001] |
| A. | 6 cm and 48 cm |
| B. | 48 cm and 6 cm |
| C. | 8 cm and 64 cm |
| D. | 64 cm and 8 cm |
| Answer» B. 48 cm and 6 cm | |
| 5354. |
The focal length of the objective and eye piece of a telescope are respectively 60 cm and 10 cm. The magnitude of the magnifying power when the image is formed at infinity is [MP PET 1991] |
| A. | 50 |
| B. | 6 |
| C. | 70 |
| D. | 5 |
| Answer» C. 70 | |
| 5355. |
The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and the eye-piece is found to be 20 cm. The focal length of the two lenses are [MP PMT 1986] |
| A. | 18 cm, 2 cm |
| B. | 11 cm, 9 cm |
| C. | 10 cm, 10 cm |
| D. | 15 cm, 5 cm |
| Answer» B. 11 cm, 9 cm | |
| 5356. |
The aperture of a telescope is made large, because [DPMT 1999] |
| A. | To increase the intensity of image |
| B. | To decrease the intensity of image |
| C. | To have greater magnification |
| D. | To have lesser resolution |
| Answer» B. To decrease the intensity of image | |
| 5357. |
In Gallilean telescope, if the powers of an objective and eye lens are respectively +1.25 D and ? 20 D, then for relaxed vision, the length and magnification will be |
| A. | 21.25 cm and 16 |
| B. | 75 cm and 20 |
| C. | 75 cm and 16 |
| D. | 8.5 cm and 21.25 |
| Answer» D. 8.5 cm and 21.25 | |
| 5358. |
For which of the following colour, the magnifying power of a microscope will be maximum |
| A. | White colour |
| B. | Red colour |
| C. | Violet colour |
| D. | Yellow colour |
| Answer» D. Yellow colour | |
| 5359. |
The magnifying power of an astronomical telescope for relaxed vision is 16. On adjusting, the distance between the objective and eye lens is 34 cm. Then the focal length of objective and eye lens will be respectively [MP PMT 1989] |
| A. | 17 cm, 17 cm |
| B. | 20 cm, 14 cm |
| C. | 32 cm, 2 cm |
| D. | 30 cm, 4 cm |
| Answer» D. 30 cm, 4 cm | |
| 5360. |
In an astronomical telescope, the focal lengths of two lenses are 180 cm and 6 cm respectively. In normal adjustment, the magnifying power will be [MP PET 1990] |
| A. | 1080 |
| B. | 200 |
| C. | 30 |
| D. | 186 |
| Answer» D. 186 | |
| 5361. |
An astronomical telescope has an angular magnification of magnitude 5 for distant objects. The separation between the objective and the eye piece is 36 cm and the final image is formed at infinity. The focal length fo of the objective and the focal length fe of the eye piece are [IIT 1989; MP PET 1995; JIPMER 2000] |
| A. | fo = 45 cm and fe = ? 9 cm |
| B. | fo = 7.2 cm and fe = 5 cm |
| C. | fo = 50 cm and fe = 10 cm |
| D. | fo = 30 cm and fe = 6 cm |
| Answer» E. | |
| 5362. |
The focal length of the objective of a terrestrial telescope is 80 cm and it is adjusted for parallel rays, then its magnifying power is 20. If the focal length of erecting lens is 20 cm, then full length of telescope will be |
| A. | 84 cm |
| B. | 100 cm |
| C. | 124 cm |
| D. | 164 cm |
| Answer» E. | |
| 5363. |
If the telescope is reversed i.e. seen from the objective side |
| A. | Object will appear very small |
| B. | Object will appear very large |
| C. | There will be no effect on the image formed by the telescope |
| D. | Image will be slightly greater than the earlier one |
| Answer» B. Object will appear very large | |
| 5364. |
Relative difference of focal lengths of objective and eye lens in the microscope and telescope is given as [MH CET 2001] |
| A. | It is equal in both |
| B. | It is more in telescope |
| C. | It is more in microscope |
| D. | It may be more in any one |
| Answer» C. It is more in microscope | |
| 5365. |
To increase the magnifying power of telescope (fo = focal length of the objective and fe = focal length of the eye lens) [MP PET/PMT 1988; MP PMT 1992, 94] |
| A. | fo should be large and fe should be small |
| B. | fo should be small and fe should be large |
| C. | fo and fe both should be large |
| D. | fo and fe both should be small |
| Answer» B. fo should be small and fe should be large | |
| 5366. |
For observing a cricket match, a binocular is preferred to a terrestrial telescope because |
| A. | The binocular gives the proper three dimensional view |
| B. | The binocular has shorter length |
| C. | The telescope does not give erect image |
| D. | Telescope have chromatic aberrations |
| Answer» B. The binocular has shorter length | |
| 5367. |
The focal length of objective and eye lens of a astronomical telescope are respectively 2 m and 5 cm. Final image is formed at (i) least distance of distinct vision (ii) infinity. The magnifying power in both cases will be [MP PMT/PET 1988] |
| A. | ? 48, ? 40 |
| B. | ? 40, ? 48 |
| C. | ? 40, 48 |
| D. | ? 48, 40 |
| Answer» B. ? 40, ? 48 | |
| 5368. |
An observer looks at a tree of height 15 m with a telescope of magnifying power 10. To him, the tree appears [CPMT 1975] |
| A. | 10 times taller |
| B. | 15 times taller |
| C. | 10 times nearer |
| D. | 15 times nearer |
| Answer» D. 15 times nearer | |
| 5369. |
If in compound microscope m1 and m2 be the linear magnification of the objective lens and eye lens respectively, then magnifying power of the compound microscope will be [CPMT 1985; KCET 1994] |
| A. | \[{{m}_{1}}-{{m}_{2}}\] |
| B. | \[\sqrt{{{m}_{1}}+{{m}_{2}}}\] |
| C. | \[({{m}_{1}}+{{m}_{2}})/2\] |
| D. | \[{{m}_{1}}\times {{m}_{2}}\] |
| Answer» E. | |
| 5370. |
For a telescope to have large resolving power the [CPMT 1980, 81, 85; MP PET 1994; DCE 2001; AFMC 2005] |
| A. | Focal length of its objective should be large |
| B. | Focal length of its eye piece should be large |
| C. | Focal length of its eye piece should be small |
| D. | Aperture of its objective should be large |
| Answer» E. | |
| 5371. |
A photograph of the moon was taken with telescope. Later on, it was found that a housefly was sitting on the objective lens of the telescope. In photograph [NCERT 1970; MP PET 1999] |
| A. | The image of housefly will be reduced |
| B. | There is a reduction in the intensity of the image |
| C. | There is an increase in the intensity of the image |
| D. | The image of the housefly will be enlarged |
| Answer» C. There is an increase in the intensity of the image | |
| 5372. |
The diameter of the objective of the telescope is 0.1 metre and wavelength of light is 6000 Å. Its resolving power would be approximately [MP PET 1997] |
| A. | \[7.32\times {{10}^{-6}}rad\] |
| B. | \[1.36\times {{10}^{6}}rad\] |
| C. | \[7.32\times {{10}^{-5}}rad\] |
| D. | \[1.36\times {{10}^{5}}rad\] |
| Answer» E. | |
| 5373. |
A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focussed on a distant object is such a way that parallel rays comes out from the eye lens. If the object subtends an angle 2o at the objective, the angular width of the image [CPMT 1979; NCERT 1980; MP PET 1992; JIPMER 1997; UPSEAT 2001] |
| A. | 10o |
| B. | 24o |
| C. | 50o |
| D. | 1/6o |
| Answer» C. 50o | |
| 5374. |
The magnifying power of a telescope can be increased by [CPMT 1979] |
| A. | Increasing focal length of the system |
| B. | Fitting eye piece of high power |
| C. | Fitting eye piece of low power |
| D. | Increasing the distance of objects |
| Answer» C. Fitting eye piece of low power | |
| 5375. |
The image formed by an objective of a compound microscope is [AIEEE 2003] |
| A. | Virtual and enlarged |
| B. | Virtual and diminished |
| C. | Real and diminished |
| D. | Real and enlarged |
| Answer» E. | |
| 5376. |
The separation between two microscopic particles is measured \[{{P}_{A}}\] and \[{{P}_{B}}\] by two different lights of wavelength 2000 Å and 3000 Å respectively, then [AIEEE 2002] |
| A. | \[{{P}_{A}}>{{P}_{B}}\] |
| B. | \[{{P}_{A}}<{{P}_{B}}\] |
| C. | \[{{P}_{A}}<3/2{{P}_{B}}\] |
| D. | \[{{P}_{A}}={{P}_{B}}\] |
| Answer» C. \[{{P}_{A}}<3/2{{P}_{B}}\] | |
| 5377. |
Wavelength of light used in an optical instrument are \[{{\lambda }_{1}}=4000\]Å and \[{{\lambda }_{2}}=5000\]Å, then ratio of their respective resolving power (corresponding to \[{{\lambda }_{1}}\]and \[{{\lambda }_{2}})\]is [AIEEE 2002] |
| A. | 16 : 25 |
| B. | 9 : 1 |
| C. | 4 : 5 |
| D. | 5 : 4 |
| Answer» E. | |
| 5378. |
Magnifying power of a simple microscope is (when final image is formed at D = 25 cm from eye) [MP PET 1996; BVP 2003] |
| A. | \[\frac{D}{f}\] |
| B. | \[1+\frac{D}{f}\] |
| C. | \[1+\frac{f}{D}\] |
| D. | \[1-\frac{D}{f}\] |
| Answer» C. \[1+\frac{f}{D}\] | |
| 5379. |
The angular magnification of a simple microscope can be increased by increasing [Orissa JEE 2002] |
| A. | Focal length of lens |
| B. | Size of object |
| C. | Aperture of lens |
| D. | Power of lens |
| Answer» E. | |
| 5380. |
A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power is 100. The magnifying power of the other lens is [Kerala PMT 2002] |
| A. | 10 |
| B. | 20 |
| C. | 50 |
| D. | 25 |
| Answer» C. 50 | |
| 5381. |
Two points separated by a distance of 0.1 mm can just be resolved in a microscope when a light of wavelength 6000 Å is used. If the light of wavelength 4800Å is used this limit of resolution becomes [UPSEAT 2002] |
| A. | 0.08 mm |
| B. | 0.10 mm |
| C. | 0.12 mm |
| D. | 0.06 mm |
| Answer» B. 0.10 mm | |
| 5382. |
The magnifying power of a simple microscope is 6. The focal length of its lens in metres will be, if least distance of distinct vision is 25\[cm\] [MP PMT 2001] |
| A. | 0.05 |
| B. | 0.06 |
| C. | 0.25 |
| D. | 0.12 |
| Answer» B. 0.06 | |
| 5383. |
If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope [DCE 2001] |
| A. | Decreases |
| B. | Increases |
| C. | Gets halved |
| D. | Remains unchanged |
| Answer» C. Gets halved | |
| 5384. |
The magnifying power of a compound microscope increases when [MP PET 2000] |
| A. | The focal length of objective lens is increased and that of eye lens is decreased |
| B. | The focal length of eye lens is increased and that of objective lens is decreased |
| C. | Focal lengths of both objective and eye-piece are increased |
| D. | Focal lengths of both objective and eye-piece are decreased |
| Answer» E. | |
| 5385. |
In a compound microscope, the intermediate image is [IIT-JEE (Screening) 2000; MP PET 2005] |
| A. | Virtual, erect and magnified |
| B. | Real, erect and magnified |
| C. | Real, inverted and magnified |
| D. | Virtual, erect and reduced |
| Answer» D. Virtual, erect and reduced | |
| 5386. |
The length of the tube of a microscope is 10 cm. The focal lengths of the objective and eye lenses are 0.5 cm and 1.0 cm. The magnifying power of the microscope is about [MP PMT 2000] |
| A. | 5 |
| B. | 23 |
| C. | 166 |
| D. | 500 |
| Answer» E. | |
| 5387. |
Microscope is an optical instrument which |
| A. | Enlarges the object |
| B. | Increases the visual angle formed by the object at the eye |
| C. | Decreases the visual angle formed by the object at the eye |
| D. | Brings the object nearer |
| Answer» C. Decreases the visual angle formed by the object at the eye | |
| 5388. |
A person using a lens as a simple microscope sees an [AIIMS 1998] |
| A. | Inverted virtual image |
| B. | Inverted real magnified image |
| C. | Upright virtual image |
| D. | Upright real magnified image |
| Answer» D. Upright real magnified image | |
| 5389. |
The objective lens of a compound microscope produces magnification of 10. In order to get an overall magnification of 100 when image is formed at 25 cm from the eye, the focal length of the eye lens should be |
| A. | 4 cm |
| B. | 10 cm |
| C. | \[\frac{25}{9}\]cm |
| D. | 9 cm |
| Answer» D. 9 cm | |
| 5390. |
Resolving power of a microscope depends upon [MP PET 1995] |
| A. | The focal length and aperture of the eye lens |
| B. | The focal lengths of the objective and the eye lens |
| C. | The apertures of the objective and the eye lens |
| D. | The wavelength of light illuminating the object |
| Answer» E. | |
| 5391. |
If the focal length of the objective lens is increased then [MP PMT 1994] |
| A. | Magnifying power of microscope will increase but that of telescope will decrease |
| B. | Magnifying power of microscope and telescope both will increase |
| C. | Magnifying power of microscope and telescope both will decrease |
| D. | Magnifying power of microscope will decrease but that of telescope will increase |
| Answer» E. | |
| 5392. |
In order to increase the magnifying power of a compound microscope [JIPMER 1986; MP PMT 1997] |
| A. | The focal lengths of the objective and the eye piece should be small |
| B. | Objective should have small focal length and the eye piece large |
| C. | Both should have large focal lengths |
| D. | The objective should have large focal length and eye piece should have small |
| Answer» B. Objective should have small focal length and the eye piece large | |
| 5393. |
The focal length of the objective lens of a compound microscope is [CPMT 1985; MNR 1986; MP PET 1997] |
| A. | Equal to the focal length of its eye piece |
| B. | Less than the focal length of eye piece |
| C. | Greater than the focal length of eye piece |
| D. | Any of the above three |
| Answer» C. Greater than the focal length of eye piece | |
| 5394. |
To produce magnified erect image of a far object, we will be required along with a convex lens, is [MNR 1983] |
| A. | Another convex lens |
| B. | Concave lens |
| C. | A plane mirror |
| D. | A concave mirror |
| Answer» C. A plane mirror | |
| 5395. |
Finger prints are observed by the use of |
| A. | Telescope |
| B. | Microscope |
| C. | Gallilean telescope |
| D. | Concave lens |
| Answer» C. Gallilean telescope | |
| 5396. |
The power of two convex lenses A and B are 8 diopters and 4 diopters respectively. If they are to be used as a simple microscope, the magnification of |
| A. | B will be greater than A |
| B. | A will be greater than B |
| C. | The information is incomplete |
| D. | None of the above |
| Answer» C. The information is incomplete | |
| 5397. |
The maximum magnification that can be obtained with a convex lens of focal length 2.5 cm is (the least distance of distinct vision is 25 cm) [MP PET 2003] |
| A. | 10 |
| B. | 0.1 |
| C. | 62.5 |
| D. | 11 |
| Answer» E. | |
| 5398. |
The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is [MP PMT 1991] |
| A. | 200 cm |
| B. | 160 cm |
| C. | 2.5 cm |
| D. | 0.1 cm |
| Answer» D. 0.1 cm | |
| 5399. |
An electron microscope is superior to an optical microscope in [CPMT 1984] |
| A. | Having better resolving power |
| B. | Being easy to handle |
| C. | Low cost |
| D. | Quickness of observation |
| Answer» B. Being easy to handle | |
| 5400. |
The magnifying power of a simple microscope can be increased, if we use eye-piece of [MP PMT 1986] |
| A. | Higher focal length |
| B. | Smaller focal length |
| C. | Higher diameter |
| D. | Smaller diameter |
| Answer» C. Higher diameter | |