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.

3401.

Relation between alpha, beta and gamma

Answer»

`alpha= beta = gamma`
`alpha=(beta)/(2)=3gamma`
`alpha=(beta)/(2)=(gamma)/(3)`
`alpha=(beta)/(2)=(gamma)/(4)`

SOLUTION :`alpha=(beta)/(2)=(gamma)/(3) or 6alpha 3 beta=2 gamma`
Discussion
3402.

An ammeter has 20 divisions between 0 A mark and 2 A mark on its scale. The least count of this ammeter is :

Answer»

0.01A
0.02 A
0.1 A
0.2 A

Solution :NA
Discussion
3403.

What is selfiecide?

Answer»

Solution :The person who is ENGROSSED in TAKING selfies is least bothered about the RISKS in the SURRONDING areas, this behaviour is called selfiecide
Discussion
3404.

Distinguish between ape and man .

Answer»

SOLUTION :
Discussion
3405.

100 J of heat is produced each second in a 4 Omega resistor. Find the potential difference across the resistor.

Answer»

SOLUTION :H= 100 J `, R= 4 Omega t = 1 ` sec .
`H=I^(2) Rt`
`I^(2) =(H)/(Rt)`
`I = sqrt((H)/(Rt))=sqrt((100)/(4xx1))=sqrt((100)/(4))=sqrt(25)=5` Ampere.
Now V= IR
V=`5xx4`
V= 20 V.
Discussion
3406.

Prove the following statement : A rainbow is the combined effect ( an exhibition ) of the refraction, dispersion , and total internal reflection of light ( taken together ) . OR With neat labelled diagram, explain how the formation of rainbow occurs.

Answer»

Solution :1. The formation of a rainbow in the sky is a combined result of refraction, dispersion, internal reflection and again refraction of sunlight by WATER dropletes present in the ATMOSPHERE after it has raineed.

2. The sunlight is a mixture of seven colours `:` violet , indigo, blue, green, yellow, orange and red. After it has stopped raining, the atmosphere contains a large number of water droplets. When sunlight is incident on a water droplet , there is (i) refraction and dispersion of light as it passes from air to water (ii) internalreflection of light insde the droplet and (iii) refractionn of light as it passes from water to air.
(3) The refraction index of water is different for different colours, being maximum for violet and MINIMUM for red. Hence, there is dispersion of light ( separation into different colours) as it passes from air to water.
(4) The combined actionof differentwater dropletes, acting LIKE tiny prisms, is to produce a rainbow with red colour at the outer side and violet colour at the inner side. The remaining five colours lie between these two.
The rainbow is SEEN when the sum is behind the observer and water droplets in the front.
Discussion
3407.

Explain the term reactant and product giving examples.

Answer»

Solution :(1) The subtanece which undergoes bondbreaking while taking port in a chemcialreaction is called reactant.
(2) The SUBSTANCE formed as a result of a chemicalreaction by formation of new BONDS is called product.
(3) Example : IN a chemical reaction, the formation of carbon DIOXIDE GAS takes place by combustion of coal in air.In this reaction, coal (carbon) and oxygen (from air) are the reactants while carbon dioxide is the product.
Discussion
3408.

Whatprecaution shouldbe taken to avoid theoverloadingof domesticelectric circuits ?

Answer»

Solution :To aviodoverloadingof domesticelectriccircuits, the followingprecautionsshouldbe taken :
(1) Wires used for carrying current should be of proper current rating .
(2) Twoseparate CIRCUITS shouldbe used , oneof5A currentfor lighttingelectric BULBS, tubes , TV, etc.andanotherof 15A for highercurrentratingappliancesuchas heatingappliances , AC, etc .
(3) Parallel circuits should be usedand each ciruitshould havea fuseof proper ratting .
(4) Too many higherpowerratingelectrical appliancesuchas electriciron , geyser , air - condition , etc . should not beswitchedon atthe same time .
(5) Too many electrical APPLIANCES shouldnot be operatedona single socketsimultaneously .
(6) Wires should bereplaced bynew wires of proper ratingand goodinsulation after every5-6 years.
(7) PVC of good qualityshouldbe used .
Discussion
3409.

What are biodiversity hotspots ?

Answer»

SOLUTION :BIODIVERSITY HOTSPOTS are REGIONS RICH in biodiversity.
Discussion
3410.

Electrical reslstivities of some substances, In ohm- meter, at 20^(@) C are given as follows : (i) Out of the silver and copper, which is a better conductor of electric current and why ?

Answer»

SOLUTION :Silver is a better conductor, LOWER RESISTIVITY.
Discussion
3411.

Give reasons Ventricles have thicker muscular walls than atria.

Answer»

SOLUTION :Ventricles have to send blood to GREAT distances, to various body parts and hence the blood pressure is HIGHER. So to withstand HIGH BP they have thicker walls.
Discussion
3412.

Define the term 'volt'. (b) State the relation between work, charge and potential difference from an electric circuit. Calculate the potential difference between the two terminals of a battery if 100 joules of work is required to transfer 20 coulombs of charge from one terminal of the battery to the other.

Answer»

Solution :The term volt is the SI unit of potential difference . Potential difference is said to be 1 volt if one joule WORK is to be done to carry 1 coulomb charge from one point to ANOTHER.
(b) The relation between work (W), charge (Q) and potential difference (V) for an electric circuit is
`V=W/Q`
Given that W=100J and Q=20C
`therefore` Potential difference `V=W/A=(100 J)/(20 C)=5V`
Discussion
3413.

Study the circuit shown in which three identical bulbs B_(1) B_(2) and B_(3)are connected in parallel with a battery of 4.5 V (i) What will happen to the glow of other two bulbs if the bulb B_(3)gets fused ? (ii) If the wattage of each bulb is 1.5 W, how much reading will the ammeter A show when all the three bulbs glow simultaneously. (iii) Find the total resistance of the circuit.

Answer»

<P>

Solution :(i) Other bulbs will glow with same brightness.
(II) When the bulbs are in parallel, wattage will be added (4.5 W) and the AMMETER reading would be
`becauseI=(P)/(V) = (4.5 W)/(4.5V)= 1.0 ` Ampere
(iii) Since ammeter reading is 1.0 ampere RESISTANCE of the combination is `(4.5V)/(1.0A)= 4.5 Omega`
Discussion
3414.

Many people come together to established a new forest but a single person. If determined can destroy the entire forest! True/False

Answer»


ANSWER :FALSE
Discussion
3415.

Find the amount of heat required to convert 10g of water at 100^(@)Cinto steam. (Spefic latent heat of vaporization of water= 540 cal //g )

Answer»


ANSWER :10800 CAL
Discussion
3416.

Observe: the images below.Is it national why ? (##NVT_SCI_TECH_DIG_X_P2_C09_E13_006_Q01.png" width="80%">

Answer»

Solution :In the above three pictures three incidences are shown.In the first picture the boy who is TALKING his lunch is shown.He is busy with his mobile while having his good.in SECOND picture a young man is talking selfie while standing in the busy road.He is not aware of the approaching car too In the third picture some men are TAKING picture of the accident that has recently happened .The person is injured and bleeding ,But these men are busy in photographing him. All the three pictures are showing irrational and improper behaviour.we should respect the food while eating.we should eat in a disciplined way .Standing in the middle of the road and taking selfie is like inviting the mishap. Selfie TAKEN in such circumstances usually results in an accident .In the last pictures the sensitivity and the humaity to save the victim is lacking.If the victim is immediately rushed to hospital,his life can be SAVED. Instead of halping the victim ifpeople ae engrossed in taking pictures ,then it is absolutely wrong.
Discussion
3417.

Plane mirror is a part of sphere of radius:

Answer»

zero
infinity
nil since it is not a PART of sphere
any VALUE DEPENDING UPON its size

Answer :B
Discussion
3418.

Linear expansion is also called as __________.

Answer»

SOLUTION :LONGITUDINAL EXPANSION
Discussion
3419.

What is first aid?

Answer»

Solution :The preliminary treatment given to a person affected by a disaster before actual medical treatment is AVAILABLE in order to prevent death or deterioration of health to start rthe PROCESS of rehabilitation, is known as FIRST AID.
Discussion
3420.

Draw the symbol of a resistor.

Answer»

SOLUTION :
Discussion
3421.

What is the principle used in Microscope ?

Answer»

Solution :It works under the PRINCIPLE of angular MAGNIFICATION of LENSES.
Discussion
3422.

Name a source of alternating current and a source of direct current.

Answer»

Solution :SOURCE of AC CURRENT : electric GENERATOR.
Source of DC current : electric cell.
Discussion
3423.

First aid

Answer»

Solution :An immediate HELP given to a SICK or injured person untill FULL medical treatment is available is called a first AID.
Discussion
3424.

What is mesoglea?

Answer»

SOLUTION :A JUNCTION between AXON of one NEURON and dendron of next neuron is called SYNAPSIS.
Discussion
3425.

The change in the __________ of light rays while going from one medium to another is called refraction.

Answer»

Solution :The change in the `ul("DIRECTION")` of light rays while going from one medium to ANOTHER OBLIQUELY is called REFRACTION.
Discussion
3426.

Shalini is a student of class X. Her mother was preparing tea in an old electric kettle having metal case. When she switched on the electrickettle. she got a severe electric shock. Shalini put off the main switch qUickly and found that the connecting cord was torn, where her mother touched the metal case of the kettle. She also found that the red and black wires of the connecting cord were firmly connected to the two lower terminals of the power plug but the green wire of the cord was not connected to the upper terminal of the plug. Shalini replaced the torn connecting cord and also connected the three wires of the cord firmly to the power plug terminals. On the basis of the above passage, answer the following questions: What values are displayed by Shalini in this incident?

Answer»

Solution :The VALUES displayed by Shalini are:
(a) Presence of MIND.
(b) Concern for her MOTHER.
(c) KNOWLEDGE of household wiring and daily LIFE activities.
Discussion
3427.

Define Magnification of a lens.

Answer»

Solution :It is defined as the RATIO of the heigh of the image to the height of an OBJECT . Magnification is DENOTED by the letter .m. If height of the object is H and height of the imageis h , the magnification produced by lens is ,
`m=("height of the image")/("height of the object")=(h)/(h)`
Also it is related to the distance of theobject (u) and the distance of the image (v) as follows:
`m=("distance of the image")/("distance of the object")=(v)/(u)`
Discussion
3428.

What is the projection of vecA on vecB ?

Answer»

`VECA*VECB`
`vecA * HATB`
`vecA XX hatB`
`hatA xx vecB`

Solution :Projection of `vec A` on `vecB`
`=(vecA* vecB)/(|vecB|)=A* (vecB)/(|vecB|)=vecA*hatB`
Discussion
3429.

Shalini is a student of class X. Her mother was preparing tea in an old electric kettle having metal case. When she switched on the electrickettle. she got a severe electric shock. Shalini put off the main switch qUickly and found that the connecting cord was torn, where her mother touched the metal case of the kettle. She also found that the red and black wires of the connecting cord were firmly connected to the two lower terminals of the power plug but the green wire of the cord was not connected to the upper terminal of the plug. Shalini replaced the torn connecting cord and also connected the three wires of the cord firmly to the power plug terminals. On the basis of the above passage, answer the following questions: Which wire red. black or green, touched the metal case of electric kettle when Shalini.s mother got electric shock?

Answer»

Solution :RED wire which is at high potential of 220 V was TOUCHING the metal case of ELECTRIC KETTLE.
Discussion
3430.

Find out the position of centre of mass of two particle system.

Answer»


ANSWER :CORRECT DERIVATION
Discussion
3431.

Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the sun's energy

Answer»

GEOTHERMAL ENERGY
Wind energy
NUCLEAR energy
Bio-mass

Solution :Nuclear energy
Discussion
3432.

Shalini is a student of class X. Her mother was preparing tea in an old electric kettle having metal case. When she switched on the electrickettle. she got a severe electric shock. Shalini put off the main switch qUickly and found that the connecting cord was torn, where her mother touched the metal case of the kettle. She also found that the red and black wires of the connecting cord were firmly connected to the two lower terminals of the power plug but the green wire of the cord was not connected to the upper terminal of the plug. Shalini replaced the torn connecting cord and also connected the three wires of the cord firmly to the power plug terminals. On the basis of the above passage, answer the following questions: Why did Shalini switch off the main switch qUickly?

Answer»

SOLUTION :Shalini SWITCHED off the main switch to cut-off the electricity supply to the faulty KETTLE in order to save her MOTHER.
Discussion
3433.

What is ideal gas ?

Answer»

SOLUTION :If the atoms or molecules of agas do not INTERACT with each other , then the gas is SAID to be an IDEAL gas or perfect gas.
Discussion
3434.

The three primary or basic colours are :

Answer»

RED, BLUE, yellow
yellow, GREEN, orange
red, green, yellow
red, green, blue

Solution :red, green, blue
Discussion
3435.

Artificial radioactivity was discovered by ______________

Answer»

BECQUEREL
IRENE CURIE
roentgen
Neils Bohr

Solution :Irene Curie
Discussion
3436.

The centre of gravity of a hollow cone of height h is at distance x from its vertex where the value of x is:

Answer»

`h//3`
`h//4`
`2h//3`
`3h//4`

SOLUTION : ( C)`2h//3`
Discussion
3437.

A domestic electrical appliance requires alternating current of 15 V. If 220 V of alternating current is supplied to the house, then the device that helps in the functioning of that electri.cal appliance is :

Answer»

INDUCTION COIL
step-up TRANSFORMER
AC DYNAMO
step-down transformer

Solution :induction coil
Discussion
3438.

(i) Define the term magnificatio. Write the formula for magnification of mirror explanning the symbols used in the formula. (ii) The magnification produced by a convex lens is -2. What is meant by this statement and also write the information regarding image obtained from it.

Answer»

SOLUTION :(i) Ratio of height of the image to height of the OBJECT is magnification.
M(mirror) `=h^(1)//h=-v//u`
h= Height of object
`h^(1)=` Height of image
v=image of distance
u= Object distance
(ii) It MEANS image FORMED is two times of size of object and the image formed is INVERTED, formed in front of the lens.
Discussion
3439.

Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the sun's energy?

Answer»

GEOTHERMAL energy
Wind energy
Fossil FUEL
Biomass

Answer :A
Discussion
3440.

. ............ and ... .. ...... .. are two important Indian satellite launchers

Answer»

SOLUTION :PSLV and GSLV
Discussion
3441.

An electric geyser rated 500 W operates one hour/day. If the cost of unit is 3.00, find the cost of energy to operate it for the month of August.

Answer»


ANSWER :RS. 46.5
Discussion
3442.

Which of the following flames is produced by a candle?

Answer»

BLUE flame
Non-LUMINOUS flame
Light GIVING flame
Yellow luminous flame

Answer :D
Discussion
3443.

If the mass of moon is (M)/(81), where M is the mass of earth, find the distance of the point where gravitational field due to earth and moon cancel each other, from the centre of moon. Given the distance between centres of earth and moon is 60 R where R is the radius of earth

Answer»

Solution :
GRAVITATIONAL field at C due to EARTH = Gravitational field at C due to earth moon
`(GM)/((60R-x)^2)=(GM"/"81)/(x^2)`
`81x^2= (60R-x)^2`
`9x=60 R-x`
`x= 6R`.
Discussion
3444.

The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationery for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was :

Answer»

moving TOWARDS the SOLENOID
moving into solenoid
at rest INSIDE the solenoid
moving out of the solenoid

Answer :D
Discussion
3445.

Name one fuel used in nuclear reactor.

Answer»

SOLUTION :Uranium-235.
Discussion
3446.

Name some devices in whichelectric motors are used.

Answer»

Solution :Electric MOTOR is used in electric FANS, mixers, grinders, coolers, REFRIGERATORS, MP 3 PLAYERS, air conditioner, washingmachines, computers, ETC.
Discussion
3447.

If suddenly the gravitational force of attraction between earth and satellite revolving around it becomes zero, then the satellite will

Answer»

Solution :The satellite will move TANGENTIALLY to the ORIGINAL orbit with a velocity with which it was REVOLVING.
Discussion
3448.

A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is 1.5xx10^(8) away from the sun?

Answer»


ANSWER :`14.30xx 10^(8)` YEARS
Discussion
3449.

What is a magnet ?

Answer»

Solution :A magnet is a PIECE of magneticmaterial , occuring naturallyor MADE artificiallyby magnetizingiron or steel , whichattracts pieces ofmagnetic substances such as IRON , nickeland COBALT .
Discussion
3450.

(a) Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor. (b) Name and state the rule to determine the direction of magnetic field around a straight current-carrying conductor.

Answer»


ANSWER :N/a
Discussion