Explore topic-wise InterviewSolutions in .

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.

3001.

Give exmaplesfor the cases in which the time of action of force is very short to have a large force ?

Answer»

Solution :(i) Striking a hammer on a nail.
(ii) Hittingcricket ball with the bat .
(iii) We gethurt more while we slip down on a concrete floor than on a mud floor .
(iv) Both the floors experiencesame amount of CHANGE in momentum. But in concrete floor the LARGER amount of force acts in shorterinterval of time . So it hurts more .
(v) When the FIELDER pulls back his hands he experiences a smallerforce for a LONGER interval of time leadingto less damage to his hands .
Discussion
3002.

Current used in domestic electric circuits at home

Answer»

SOLUTION :ALTERNATING CURRENT
Discussion
3003.

Arrange the words in a correct order of functioning. Load(bulb) , Wire , and battery , Voltage

Answer»

Solution :WIRE and battery, Voltage , CURRENT , LOAD (BULB)
Discussion
3004.

Name the part of a biogas plant where reactions take place in the absence of oxygen.

Answer»

SOLUTION :DIGESTER.
Discussion
3005.

Which of the two has a great power? A lens of short focal length or a lens of large focal length.

Answer»

Solution :Lens of short FOCAL LENGTH has a great power
Discussion
3006.

What is ecosystem? Which are its differentcomponents ?

Answer»

Solution :a. Refer Answer .
B. Ecosystem MAINLY CONSISTS of two components `:`
1. Biotic components.e.g., Producers , consumers, decomposers.
2. ABIOTICCOMPONENTS e.g., Soil , water, air, sunlight, TEMPERATURE etc.
Discussion
3007.

When a light ray is incident normal to the interface between any two media,the angle of incidence is zero.

Answer»


ANSWER :TRUE.
Discussion
3008.

Light travels in the same direction in all media.

Answer»


Answer :False. Light does not TRAVEL in the same DIRECTION in all MEDIA.
Discussion
3009.

Cell phone is killing social life. Explain.

Answer»

Solution :1. Persons spending time with cell phones foe several hours are usually unaware of the surrounding. This is ALSO a sort of addiction and leading to endangering of the social health.
2. Various physical problems LIKE tiredness, headache, insomnia, forgetfulness, tinnitus, joint pains and problem in vision may arise due to radiation of cell phones.

3. More SERIOUS FACT is those radiations penetrate the bones of children more effecitively than the bones of adults.
4. They cannot establish harmonious relations with relatives and other mumbers of the society. HENCE, cell phones is killing social life.
Discussion
3010.

Thoughtortoise lives on land as well as in water, it cannot be included in class-Amphibia.

Answer»

SOLUTION :(1) When tortoise lives on the land, it respires with the help of lungs. When in water, it putsits nares( nasal OPENINGS ) out of thewater and breathes air. (2) It cannot take up oxygen dissolved in water. In both the HABITATS it respires with the help of lungs. (3) In case of true amphibians, this is not the case. (4) They can breathe in water with the help of skin and on land with the help of lungs. Tortoise ALSO has exo-skeleton which is lacking in AMPHIBIA. Therefore, tortoise cannot be included in class Amphibia.
Discussion
3011.

Draw ray diagram showing the image formation by a concave lens when an object is placed(a) at the focus of the lens(b) between focus and twice the focal length of the lens(c ) beyond twice the focal length of the lens

Answer»

SOLUTION :
Discussion
3012.

State Ohm's law Express it mathematically. (b) Write symbols used in electric circuits to represent: (i) variable resistance (ii) Voltmeter. ( c) An electric bulb is rated 220V and 100W. When it is operated on 110V,what will be the power consumed?

Answer»

SOLUTION :According to Ohm.s law physical condition like temperature remaining constant, the current passing through a conductor is directly proportional to the POTENTIAL difference maintained across the ends of the conductor i.e.,
`V prop I or V=IR`
Here R is known as the resistance of given conductor. It is a PROPERTY of the conductor which affects the FLOW of current. For a given conductor value of resistance R is a constant R is a constant at a given temperature
(b) Symbols for given electrical components are given below:
(i) VARIABLE resistance
(ii) Voltmeter
Discussion
3013.

A conducting wire of length 1 has resistance R. If its length is increased to nl by stretching it uniformly, what would be the new resistance of wire ? (Assume that there is no change in the volume of the wire when it is stretched.)

Answer»

Solution :Original length of the wire = l
and AREA of cross-section=A.
New length of the wire l.= NL
New area of the cross-section of wire = A.
Here, Al-A.l. = A. (nl)
( `:.` It is GIVEN that the volume of the wire remains constant when it is stretched.)
`:.` New area of cross-section of the wire,
`A. = A/n`
Oiginal resistance of the wire, `R = rho . l/A`
Newresistance of the wire.
`R.= rho. (l.)/(A.)`
`= rho . (nl)/(A/n) = n^2 (rho . l/A)`
`:. R. = n^2 R`
(Note: If the length of the wire is doubled (n=2), the new resistance of the wire will be `R. = (2)^2 R = 4R`.]

* You need not memorise these values.You can use these values for solving NUMERICAL problems.
Discussion
3014.

The focal length of a glass lens in air is f. When immersed in water (refractive index mu) its focal length would be

Answer»

f
`ltf`
`gtf`
nothing can be decided

Solution :It MUST be remembered that the focal length of a lens SUBMERGED in water becomes four TIMES its focal length in air.
`f_(omega)=4f_(a)`
Discussion
3015.

________ is the centre part of the iris.

Answer»

pupil
retina
pupil
eye lens

Answer :C
Discussion
3016.

A person is able to see objects clearly only when these are lying at a distance between 50 cm and 300 cm from his eye. (a) What kind of defects of vision is he suffering from ? (b) What kind of lenses are required to increases his range of vision from 25 cm to infinity ? Explain briefly.

Answer»

Solution :(a) The PERSON.s eyes are having near POINT away from 25 cm and far point lesser than infinity. Hence, he suffering from both myopia and hypermetropia.
(b) The person requires BIFOCAL lenses to INCREASES his range of vision. The upper part of the bifocal lens is a concave lens which facilities distant vision while the lower part is a convex lens which facilities near vision.
Discussion
3017.

Which is themost abundant and renewable energy?

Answer»

THERMAL POWER
SOLAR energy
Fossil fuels
Atomic power

Answer :B
Discussion
3018.

Penis:

Answer»

Solution :Transferring of sperms to vagina at the time of intercourse. RELEASE of URINE at the time of URINATION.
Discussion
3019.

If the image formed by a lens for all position of the object placed in front of it is always virtual, erect and diminished, state the type of the lens. Draw a ray diagram in support of your answer. If the numerical value of focal length of such a lens is 20 cm find its power is new cartesian sign conventions.

Answer»

SOLUTION :DIVERGING lens/ concave lens

Focal length = -20 CM (lens is concave hence F is - ve)
Power=P
`=1//f`
`=100//-20cm`
`=-5D`
Discussion
3020.

Compare and contrast biomass and hydro electricity as sources of energy.

Answer»

SOLUTION :
Discussion
3021.

An __________ is a closed conducting loop or path, which has a network of electrical components through which electrons are able to flow.

Answer»

SOLUTION :ELECTRIC CIRCUIT
Discussion
3022.

State the number of significant figures in 86400m

Answer»

Solution : 5 since it comes from a MEASUREMENT the last TWO ZEROS become significant.
Discussion
3023.

Boron - 10 and Boron - 11 are called ………………… .

Answer»

ISOTOPES
ISOBARS
ISOTONES
ISOMERS

ANSWER :A
Discussion
3024.

Assertion: Gas is highly compressible than solid and liquid Reason: Interatomic or intermolecular distance in the gas is comparably high.

Answer»

Both the assertion and the reason are TRUE and the reason is the CORRECT EXPLANATION of the assertion
Both the assertion and the reason are true but the reason is not the correct explanation of the assertion
Assertion is true but the reason is false
Assertion is false but the reason is true.

ANSWER :A
Discussion
3025.

What is the SI unit of [i] electric energy, and [ii] electric power?

Answer»

SOLUTION :SL unit of electric energy is JOULE, SI unit of electric power is WATT.
Discussion
3026.

300 J of work is done in sliding a 2 kg block up on inclined plane of height 10m. Work done against frictin is (g=10ms^(-2))

Answer»

1000 j
200 J
100 J
Zero

Solution : TOTAL work DONE =GAIN in P.E. + Work done against friction
`300=2xx10xx10+WimpliesW=100J`
Discussion
3027.

Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A ?

Answer»

Solution :V= 220 V
P 10 W
` P = (V^(2))/(R)`
`R = (V^(2))/(P)`
`= (220xx220)/(10)`
`4840 Omega`
V =IR
`R_(p) = (V)/(I) = (220)/(5) = 44Omega`
`R_(p) = (R)/(n) implies n = (R)/(RP)= (4840)/(44) = 110`
Discussion
3028.

In leech, clitellum is present to ………………….

Answer»

EXCRETE waste
PRODUCE COCOON
produce gametes
digest FOOD materials

Solution :produce cocoon
Discussion
3029.

The aquaticanimalslivemore in coldregionWhy ?

Answer»

Solution :. Aquatic animals live more in COLD regions because, solubility of OXYGEN is more in cold WATER. Therefore, aquatic animals are more COMFORTABLE in cold water.
Discussion
3030.

Name the microorganisms which decompose cowdung biogas.

Answer»

SOLUTION :ANAEROBIC BACTERIA.
Discussion
3031.

An Athlete in the Olympic games covers a distance of 100 m in 10s, this kinetic eneryg can be estimated to be in the range (assume m=60kg)

Answer»

200J-500J
`2XX10^(5)J-3xx10^(5)j`
`20000J-50000J`
`2000J-5000J`

SOLUTION :`V_(av)=5/t=10ms^(-1),m=60 kg implies`Av K.E. =3000J
Discussion
3032.

Surveys the plants and animals in your area. Maintain a record about their characteristics.

Answer»

SOLUTION :i. Plants can be identifiedon the basis of following characteristics `:`
a. Presence or absence of organs like, stems and leaves.
b. Presence or absence of FLOWERS,fruits and seeds.
C. Whether seeds are enclodes within a fruit or not.
d. Number of cotyledons in the seeds.
II. Animals can be identified based on the following characteristics `:`
a. Amphibians -LARVAL forms live in water, whereas adults can live on land as well as in water, e.g., Frogs.
b. Pisces - Presence of paired, unpaired fins,spindle-shaped body. e.g., Fishes -Rohu
c. Reptiles-Creep on land. Their skin is dry and scaly, e.g., Lizards.
d. Aves- Exoskeleton is present in the form of feathers. e.g., Birds-crows,sparrows.
e. Mammals- Presence of mammary glands. Body is covered with hairs or fur. e.g., Dogs.
f. Annelids -Body is metamerically segmented and covered with cuticle .e.g.,Earthworms
g. Arthropods - They have joined appendages and chitinous exoskeleton. e.g., Cockroaches
h. Molluscs - Body is soft and slimy and most of them have have calcareous shell, e.g., Snail.
Discussion
3033.

Consider the following circuits : On plugging the key, the voltmeter/ammeter is likely to be damaged :

Answer»

in CIRCUIT A
in circuit B
in circuit C
in circuit D

Solution :NA
Discussion
3034.

Addictive substances : Drugs :: Carcinogenic (Cancer causing ) substances ___________

Answer»


ANSWER :TOBACCO
Discussion
3035.

Which colour suffers least deviation on passing through a prism ?

Answer»

SOLUTION :RED colour deviates through MINIMUM angle.
Discussion
3036.

Which projects will you run in relation to environmental conservation ? How ?

Answer»

Solution :i. Projects on COLLECTION of plastic wastes for recycling, CONSERVATION of biodiversity, tree plantation programme etc., can be carried out for environmental conservation.
ii. These projects can be carriedout in the following ways `:`
a. Explaining the adverseeffects of use of plastic on environment, DISPOSAL and management of WASTE to people.
b. Convincing people about the importance of trees and the need to participate in tree plantation campaign.
c. Making posters that provide more information about environment conservation, saving energy and other natural resources to raise PUBLIC awareness.
d. Organizing seminars in which environment a lists will guide students about environment conservation.
e. Spreading awareness through celebrating earth day and environment protection day.
Discussion
3037.

Which part of the solar cooker is responsible for greenhouse effect ?

Answer»

Solution :The glass sheet in the solar cooker creates a GREENHOUSE effect. Glass sheet has a property that allows the infra - red of shorter wavelength form the SUN to get in the device but does not allow the infra - red rays of longer wavelength to leave the solar HEATING device. THEREFORE , heat energy is trapped the heating device.
Discussion
3038.

Newtons lawof gravitation helps in discoveringnew starsand planets .

Answer»


ANSWER :TRUE
Discussion
3039.

The animal of prey have :

Answer»

TWO EYES at the FRONT
two eyes at the back
two eyes on the sides
ONE eye at the front and one on the side

Solution :NA
Discussion
3040.

Name the type of mirrors used in the design of solar furnaces. Explain how high temperature isachieved by this device.

Answer»

Solution :Concave mirrors are used in the design of solar furnaces. When a solar furnace is PLACED at the FOCUS of a large concave MIRROR (called REFLECTOR), it focuses a parallel beam of light on the furnace, as a result a TEMPERATURE is achieved after some time.
Discussion
3041.

Which of the follwing has high resistance ?

Answer»

THICK WIRE
THIN wire
length wire
short wire

Answer :B and C
Discussion
3042.

In which of the following , no change in mass number of the daughter nuclie takes place ? (i) alpha decay(ii) beta decay (iii) gamma decay(iv) neutron decay

Answer»

(i) is CORRECT
(ii) and (III) are correct
(i) & (IV) are correct
(ii) & (iv) are correct

Solution :(ii) and (iii) are correct
Discussion
3043.

Name the type of mirrors used in the design of solar furnaces. Explain how hgih temperature is achieved by this device.

Answer»

SOLUTION :(i) Concave Mirrors/Converging Mirrors.
(ii) When a solar FURNACE is placed at the focus of a large concave mirror/reflector, it focuses a parallel beam of light on the furnace, consequently a high TEMPERATURE is achieved after some time.
Discussion
3044.

Characters of a phylum are given below . Read them carefully and answer the question : (a) Spines of calcium carbonate are present on the body . (b) These animals are exclusively marine. (c) They perform the locomotion with the help of tube -feet . (d) Their skeleton is made up of calcareous plates or spicules. These animals can be classified with the help of which criteria of new system of animals classification.

Answer»

Solution :ANIMALS are clssified on the BASIS of CRITERIA such as BODY organization , body symmetry ,body CAVITY , etc.
Discussion
3045.

A girl is standing in front of a magic mirrro. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The order of combinations for the magic mirror from the top is

Answer»

Convex, plane and concave
Plane, convex and concave
Concave, plane and convex
Convex, concave and plane

SOLUTION :Concave MIRROR FORMS magnified image of HEAD, plane mirror forms image of the middle portion of body having same size and convex mirror forms diminished image of LEGS.
Discussion
3046.

Characters of a phylum are given below . Read them carefully and answer the question : (a) Spines of calcium carbonate are present on the body . (b) These animals are exclusively marine. (c) They perform the locomotion with the help of tube -feet . (d) Their skeleton is made up of calcareous plates or spicules. (i) Animals of which phylum show the above character ?

Answer»

SOLUTION :Animals belonging to phylum ECHINODERMATA SHOW the above characters .
Discussion
3047.

Characters of a phylum are given below . Read them carefully and answer the question : (a) Spines of calcium carbonate are present on the body . (b) These animals are exclusively marine. (c) They perform the locomotion with the help of tube -feet . (d) Their skeleton is made up of calcareous plates or spicules. Give an example from that phylum.

Answer»

SOLUTION :STARFISH , brittlestar, SEA URCHIN.
Discussion
3048.

The doctor prescribed her reading glasses, which can only worn for close-up work such as reading what value did Mr. Ramji exhibit?

Answer»

Solution :Mr. RAMJI exhibited these qualities
(1) KINDNESS(2) Compassion
(3) Concern for OTHERS.
Discussion
3049.

The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17g are added to the box. What is (a) total mass of the box (b) the difference in masses of gold pieces to correct significant figures.

Answer»

Solution :DIFFERENCE in MASS of gold pieces = `0.02 g`
In correct SIGNIFICANT figure (2 significant fig. minimum DECIMAL) will be 0.02 g.
Discussion
3050.

Velocity of sound is maximum in .............

Answer»

Solid
Liquid
Gases
All the above

Answer :a
Discussion