InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 4401. |
Explain how echoes are used by bats to judge the distanceof an obstacle in front of them. |
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Answer» Solution :1) Bats search out prey and fly in DARK night by emitting and DETECTING reflections of ultrasonic waves. 2) The high pitched ultrasonic squeaks of the bat are reflectedfrom the obstacles or prey and RETURNED to bat's ear. 3) The NATURE of reflections tellsthe bat where the obstacleor prey is and what it is like. 4) The bats use ultrasound for navigation and location of the food in dark. |
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| 4402. |
Device which converts mechanical energy to electrical energy |
| Answer» SOLUTION :ELECTRIC GENERATOR | |
| 4403. |
In compound microscope , as compare to eye piece, objective lens has _________ focal length |
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Answer» `-ve` FOCAL LENGTH |
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| 4404. |
What will be the effect on maximum height of a projectile when itsangle of projection is changed from 30^(@)to 60^(@) , keeping the same initial velocity of projection? |
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| 4405. |
Find the equivalent resistance across the two ends A and B of this circuit. |
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Answer» Solution :`(1)/(R_(1,2))=(1)/(R_(1))+(1)/(R_(2))=(1)/(2)+(1)/(2)=(2)/(2)=1 Omega` SIMILARLY `R_(3,4)= 1 Omega` `R_(5,6)= 1Omega` `R_(7,8) = 1 Omega` Now `R_(1,2) ` and `R_(3,4) ` are connected in SERIES `R_(1,2,3,4) = R_(1,2)+ R_(3,4)= 1+1=2 Omega` Also `R_(5,6)` and `R_(7,8)` are connected in series `R_(5,6,7,8) = R_(5,6)+ R_(7,8) = 1+1= 2 Omega` Now equivalent resistance `(1)/(R) = (1)/(R_(1,2,3,4))+(1)/(R_(5,6,7,8))= (1)/(2)+(1)/(2) = (2)/(2) = 1 Omega` `R =1 Omega` |
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| 4406. |
List two properties of the images formed by convex mirrors. Draw ray diagram in support ofyour answer. |
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Answer» Solution :(i) It forms virtual and erect image. (II) It forms image SMALLER than the OBJECT. 
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| 4407. |
The best way of direct dating fossils of recent origin is by….......... |
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Answer» Radio-carbon method |
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| 4408. |
V-1 graph for a conductor is as shown in figure. (i) What do you infer from this graph ? (ii) State the law exprased here. Name the physical quantity repraented by the slope of this graph and state its SI unit |
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Answer» Solution :(i) Inference drawn is that V `ALPHA` I (ii) The STATES that the current passing through a Law conductor is directly proportional to the potential DIFFERENCE across Its ends, provided the physical conditions like temperature, density, etc, remain unchanged. This is ohm.s law. (iii) Slope of the graph REPRESENT: Resistance, unit is ohm. |
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| 4409. |
Electric field due to a single charge is |
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Answer» asmmetric |
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| 4410. |
Optical centre of lens. |
Answer» SOLUTION :
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| 4411. |
Complete the passage using following terms- Terms : science and technology, launch vehicles, 2500, PSLV, PSLV, GSLV, national and social, GSAT, television, education, natural resources and disaster management, IRNSSIndia has made remarkable progress in the ...... (a) ...... . of launch vehicles. Varioustypes of ...... (b) ... .... have been developed to put satellites having weight up to ... .. .(c) ....... kg, into all types of orbits .. ..... (d) .... ... and .. .. .. (e) ....... are two importantlaunchers. The scientific and technological feats achieved by India in this field have a significant contribution to the ...... (f) ....... development. INSAT and ...... (g) .... .. satellite series is actively working in the field of telecommunication, ...... (h) ...... . broadcasting and meteorological services. Availability of television, telephone and internet services all over the nation has been possible due to these satellites only. EDUSAT satellite in this series is used specially in the field of ...... (i) ......... IRS satellite series is working for monitoring and management of ...... (j) ......... To exactly locate position of any place on the earth's surface in terms of its precise latitude and longitude, the ...... (k) ....... satellite series has been established. |
| Answer» Solution :(a) science and technology ,(b) LAUNCH vehicles,(c) 2500,(d) PSLV ,(e) GSLV, (f) national and social , (G) GSAT , (h) television, (i) EDUCATION , (j) natural resources and DISASTER MANAGEMENT , (k) IRNSS | |
| 4412. |
Consider a simple pendulum having a bob attached to a string that oscillates under the action of a force of gracity. Supposethat the period of oscillation of the simple pendulum depends on its length (I), mass of the bob (m) and acc. Due to gravity (g). Derive the expression for its time period using method of dimensions. |
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| 4413. |
Define electric current and give an experssion to it. |
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Answer» Solution :Electric current is called as the AMOUNT of charge crossing any section of the CONDUCTOR in one SECOND. Let Q be the charge crossing any cross section of the conductor in time 't'. `therefore"Electric current"=("Electric charge")/("Time interval")` `I=(Q)/(t)` The S.I unit of current is 'ampere' denoted by 'A'. |
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| 4414. |
A ___ lens always produce virtual and diminished image. |
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Answer» BICONVEX |
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| 4415. |
Which material protects us from radiation ? |
| Answer» Solution :Lead COATED aprons and lead gloves should be used while working with HAZARDOUS area. These MATERIALS are used to PROTECTS us from radiation, | |
| 4417. |
Find the focal length of a lens of power -2.0D. What type of lens is this? |
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Answer» SOLUTION :POWER of LENS, P=1/f p=-2D f=-1/2=-0.5m A concave lens has a negative focal length. Hence, it is a concave lens. |
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| 4418. |
If objects of equal masses are given equal heat, their final temperature will be different. This is due to difference in their ............... . |
| Answer» SOLUTION :SPECIFIC HEAT CAPACITY | |
| 4419. |
To prepare a good temporary mount of the petunia leaf peel showing many stomata, from where does the student has to get the peel? |
| Answer» Solution :The STUDENT has to GET the peel from lower surface of the LEAF because stomata are more NUMEROUS on the lower epidermis. | |
| 4420. |
A light ray enters from medium A to medium B as shown in Figure. The refractive index of medium A relative to B will be |
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Answer» GREATER than unity |
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| 4421. |
A charged particle enters at right angles into a uniform magnetic field as shown : What should be the nature of charge on the particle if it begins to move in a direction pointing vertically out of the page due to its interaction with the magnetic field ? |
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| 4422. |
What is the function of a commutator in an electric motor ? |
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| 4423. |
Your father cannot see the objects at the distance of 10 cm from the eyes clearly. What is his vision defect ? |
| Answer» SOLUTION :No VISION DEFECT. | |
| 4424. |
The line joining the centre of curvature and the optic centre is pole. |
| Answer» Solution :Correct STATEMENT- The line joining the CENTRE of curvature and the OPTIC centre is principal axis. | |
| 4425. |
A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is. |
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Answer» equal to the TIME of fall |
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| 4426. |
Distance covered-time graph cannot be |
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Answer» a CLOSED CURVE |
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| 4427. |
An object is placed at a distance of 20 cm in front of convex mirror of radius of curvature 30 cm. Find the position and nature of the image. |
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Answer» Solution :Here u=-20cm, r=30cm `f=R/2=30/2=15cm` Using MIRROR FORMULA and SUBSTITUTING the above values we get `v=60/7cm` The image will be formed at a distance of `60/7` cm behind the mirror. Nature of image: VIRTUAL and erect. |
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| 4428. |
''Coal is a non renewable source of energy'' Because |
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Answer» COAL is replenished SOON in the nature |
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| 4429. |
What is anamolous behavious of water? Also explain the following : In cold regions in winter,the rocks crack due to anomalous expansion of water. |
| Answer» Solution :Sometimes water enters into crevices of the rocks.When the temperature of the atmosphere FALLS below `4^(@)C`, water EXPANDS .EVEN when water freezs toform ICE, there is increase in its volume.As thereis no room for expansion, it exerts a tremendous pressure on the rocks which crack and break up into small PIECES. | |
| 4430. |
Howto convertlightdispersedbyperismagaininto whitelight? |
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Answer» By usingwhite lightrays |
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| 4431. |
How much current will an electric bulb draw from 220 V source if the resistance of the bulb is 1200 Omega ? lf in place of a bulb, a heater of resistance 100 Omega is connected to the sources calculate the current drawn by it . |
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Answer» Solution :`I_(1) V//R_(1)= (220V)/(1200)=0.18 ` Amp. `I_(2) = V//R_(2)=(220V)/(100)= 2.2 ` Amp. |
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| 4432. |
The pH of a solution is 3. Its [OH^(-)] concentrationis ................... . |
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Answer» `1XX10^(-3)` M |
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| 4433. |
When light rays enter the eye, most of the refraction occurs at the |
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Answer» CRYSTALLINE lens |
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| 4434. |
Give an example in which a force does work on a body but fails to change its Kinetic energy. |
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Answer» Solution :When a BODY is PULLED on a rough, horizontal SURFACE with constant VELOCITY. Work is DONE on the body but K.E. remains unchanged. |
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| 4435. |
How is the directions of electric field and moment of free electrons ? |
| Answer» SOLUTION :OPPOSITE | |
| 4436. |
An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length 15.0 cm.(i) At what distance from the mirror should a screen be placed in order to obtain a sharp image.(ii) Find the size of the image.(iii) Draw a ray diagram to show the formation of image in this case. |
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Answer» Solution :(i) Object-size, H=+4.0 cm, Object-distance, u = -25.0 cm, Focal length, f = -15.0 cm, From mirror formula, `1/v=1/f-1/u=(1)/(-15)-(1)/(-25)=-(1)/(15)+(1)/(25)` or`1/v=(-5+3)/(75)=(-2)/(75)` orv=-37.5 cm So the screen should be placed in front of the mirror at 37.5 cm (II)Magnification, m=`(h.)/(h)` = `-v/u` `implies` Image-size,h. = `-(vh)/(u)`=`-((-37.5)(+4.0))/((-25))` = -6.0 cm So height of image is 6.0 cm and the image is an invested image. (iii) Ray diagram SHOWING the formation of image is given below : 
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| 4437. |
Calcium floats on water during the reaction with water. Give reason |
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Answer» Solution :Calcium reacts with water less vigorously hence the heat evolvedis not sufficint for gydrogen to CATCH fire. Instead, callcium FLOATS on water because the BUBBLES of hydrogen gas fromed stck to the SUFACE of the metal. |
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| 4438. |
What is the of 1 KWH in joules ? |
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Answer» Solution :`1" KWH "=1000Wxx1" HOUR "` `=1000J//sxx60xx60"sec."""("WATT"="JOULE"//"sec")` =3600 x 1000 j `=3.6xx10^(6)" joules. "` |
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| 4439. |
A concave lens has a focal length of 15 cm. At what distance should the object from the lens be placed so that if forms an image at 10 cm from the lens? Also, find the magnification produced by the lens. |
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Answer» Solution :f=-15cm, a=-10cm, u=? `1/v-1/u=1/f` `1/10-1/u=1/(-15)` `=(-3+2)/30=-1/30` `impliesu=-30cm` Magnification `m=e/u=(-10)/(-30)` `=1/3` |
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| 4440. |
Ten bulbs are connected in a series circuit toa power supply line. Ten identical bulbs are connected in a parallel circuit to an identical power supply line. (a) Which circuit would have the highest voltage across each bulb? (b) In which circuit would the bulbds be brighter? (c) In which circuit. if one bulb blows out, all others will stop glowing? (d) Which circuit would have less current in it? |
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| 4441. |
Define the term power of accommodtion. Write the modification in the curvature of the eye lens which enables us to see the nearby objects clearly. |
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Answer» Solution :The ability of the EYE lens to abjust its focal length, so as to clearly focus rays coming from distant as well as NEAR objects on the retina, is CALLED the power of accommodation of the eye. The ciliary muscles contract which increases the curvature of eye lens and it THICKENS which enables us to see the nearby objects clearly. |
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| 4442. |
Name the expansion of volume of a liquid taking into consideration of the expansion of container also. |
| Answer» SOLUTION :It is CALLED REAL VOLUME EXPANSION. | |
| 4443. |
Explain giving reason the type of lens used to correct the defect of vision in myopia. |
| Answer» Solution :In myopia, IMAGE is formed in FRONT of the retina instead of on the retina. This DEFECT can be corrected by USING a concave lens of a suitable power which BRINGS the image back to the retina. | |
| 4445. |
If a substance is heated or cooled, the change in mass of that substance is |
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Answer» positive |
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| 4446. |
What happens to resistance of a conductor when its temperature is increased? |
| Answer» SOLUTION :On increasing the TEMPERATURE, the RESISTANCE of GIVEN conductor also increases. | |
| 4447. |
A cricketer catches a ball of mass 150 gm in 0.1s and which is moving with a speed of 20 ms^(-1), then he experiences force of……………………. |
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Answer» 300 N `F.DELTAT=mv - m U` `THEREFORE F=(mv-m u)/(Deltat)` `=(150xx10^(-3)xx20)/(0.1)=30N` |
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| 4448. |
When is the torce experienced by a current- carrying conductor placed in a magnetic field largest? |
| Answer» SOLUTION :When the conductor is PLACED perpendicular to the direction of MAGNETIC field. | |
| 4449. |
The focal length of the eye lens increses when eye muscles. |
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Answer» are relaxed and LENS BECOMES thinner |
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| 4450. |
What can you as an individual do to reduce your consumption of the various natural resources ? |
| Answer» Solution :As an individual , I will try my best to use or consume only minimum and the required AMOUNT of food , CLOTHES , TOYS , books and ELECTRICITY. | |