Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Why a hollow glass sphere which floats with its entire volume submerged in water at 4 C, sinks when water is heated above 4 C. ICSE Class 9 Physics Chapter Heat and Energy

Answer»

Heat = MEANING was a hery HOTNESS Energy = You take a food and you was a very healthy boy Explanation:ICSE meaning is a INTRODUCE central state enemiesAnd please mark a brainlist

2.

Why is the use of wood as a fuel not advisable although wood is a renewable source of energy? ICSE Class 9 Physics Chapter Heat and Energy

Answer»

Wood in general is a non-renewable source of energy. Extensive use of WOODS as a source of energy will result in DEFORESTATION and CONSEQUENTLY raise the carbon dioxide (greenhouse gas) level in out atmosphere and also disrupt the NATURAL habitat of many species. Burning of woods releases other UNNECESSARY gases too.

3.

Two bodies at different temperatures are placed in contact. State the direction in which heat will flow. ICSE Class 9 Physics Chapter Heat and Energy

Answer»

From HOT BODY to cool body Explanation:To MAINTAIN equilibrium

4.

Deep pond of water has its top layer frozen during winter. State the expected temperature of water layer (i) just in contact with ice, (ii) at the bottom of pond ICSE Class 9 Physics Chapter Heat and Energy

Answer»

the temperature of water which is just in contact with the Ice will be 0 degree CENTIGRADE and at the bottom of the POND,it will be SLIGHTLY warmer.hope it helps and PLS mark as BRAINLIEST:)

5.

A block of wood is so loaded that it just floats in water at room temperature. What change will occur in the state of floatation, if (a) some salt is added to water (b) water is heated? Given reason. ICSE Class 9 Physics Chapter Upthrust in Fluids,Archimedes Principle and Floataion

Answer»

(a) if some salt is added no Change will OCCUR to the block of wood because the HIGHER density the heavier weight OBJECT will floats on water (b) if water is heated there will be EFFECT on the log of wood it will float on water vigorously

6.

A solid iron ball of mass 500 g is dropped in mercury contained in a beaker. Will the ball float or sink?Give reason. What will be the apparent weight of ball? Give reason ICSE Class 9 Physics Chapter Upthrust in Fluids,Archimedes Principle and Floataion

Answer» L will be float because MURCURY is 30x DENSE from WATER
7.

A sphere of iron and another of wood, both of the same radius are placed on the surface of water. State which of the two will sink? Give reason to your answer ICSE Class 9 Physics Chapter Upthrust in Fluids,Archimedes Principle and Floataion

Answer»

The SPHERE made of ironExplanation:Iron when COMPARED to wood has a relatively higher density when TAKEN in the same amount.hope it helped:)

8.

A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from jar is pumped out? Explain your answer. ICSE Class 9 Physics Chapter Upthrust in Fluids,Archimedes Principle and Floataion

Answer»

tion:In this case the balloon will burst and HELIUM will spread in jar . It will HAPPEN because after evaculation of air there will be no air and DUE to the LAKE of air and its pressure the balloon will feel more pressure inside the WALL so in that case the helium inside the balloon will put more pressure on the wall of balloon and balloon will burst or explode.

9.

Give two reasons for the use of mercury as a barometric liquid. ICSE Class 9 Physics Chapter Pressure in Fluids and Atmospheric Pressure

Answer»

tion:Mercury is COMMONLY used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric PRESSURE. A BAROMETER using water, for instance, WOULD need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference....Hope it will help u...Thanks...❤❤❤

10.

Will a body weigh more in air or in vacuum when weighed with a spring balance?Give a reason for your answer. ICSE Class 9 Physics Chapter Upthrust in Fluids,Archimedes Principle and Floataion

Answer»

ll weigh more in air than in VACUUM because in vacuum CONSIDERATION of external FORCES are nil.

11.

Why two holes are made in a sealed tin can to take out oil from it. ICSE Class 9 Physics Chapter Pressure in Fluids and Atmospheric Pressure

Answer»

when one hole is made flow will be slow it is because TGE air pressure enters same hole and when two HOLES are made the fow of OIP is incresed and air pessure enters through that hole...HOPE it HELPS..mark it as brainliest

12.

Explain why after alighting from a moving bus, one has to run for some distance in the direction of bus in order to avoid falling ICSE Class 9 Physics Chapter Newton's Law of Motion

Answer»

Explanation:because of inertia of motionThe MAN jumping out from a moving bus possesses the inertia of motion. As the man lands on the gorund, feet come to rest IMMEDIATELY while the upper part of body continue to move due to inertia of motion and hence the person may fall forward.so, in order to match with motion of upper part of body, we need to RUN for some DISTANCE, to avoid falling.

13.

How is the gravitational force between two masses affected if the separation between them is doubled? ICSE Class 9 Physics Chapter Newton's Law of Motion

Answer»

the GRAVITATIONAL force between two MASSES BECOMES 1/4rth when the distance between them is doubled.

14.

Explain why People often shake branches of a tree for getting down the fruits ICSE Class 9 Physics Chapter Newton's Law of Motion

Answer»

because when we shake BRACHES the braches suddenly come into MOTION due to inertia of motion but fruits reamain in STATE of rest..so as to resist the state of mation..fruits OFTEN get DETACHED nd people can get fruits when they fall down

15.

Why does a ball thrown vertically upwards in a moving train,come back to the thrower's hand? ICSE Class 9 Physics Chapter Newton's Law of Motion

Answer»

The ball COMES BACK DUE to.the graviataional force of earth on the ball i.e gravity on the ball.hope this help you

16.

Why does a coin placed on a card, drop into the tumbler when the card is rapidly flicked with the finger? ICSE Class 9 Physics Chapter Newton's Law of Motion

Answer»

this is due to the INERTIA of REST the COIN wants to remain in the INITIAL POSITION.

17.

How can you find the following? (i)Displacement from velocity-time graph (ii) Acceleration from velocity-time graph. (iii) Velocity from a displacement-time graph. (iv) Velocity from acceleration-time graph. ICSE Class 9 Physics Chapter Motion in One Dimension

Answer»

this FORMULAS can be USED

18.

Why upward force on any ball is m(g+a). explain ..​

Answer»

e acceleration due to GRAVITY. Here, G is ADDED with acceleration because the ball is thrown upward under gravity.Hope this will help YAA buddy...^_^

19.

A 3cm cube of iron has one face at 100°C and the other in a block of ice at 0°C. If k ofiron 0.2 CGS units and L for ice is 80cal/gm.then the amount of ice that melts in 10 minutesis (assume steady state heat transfer)​

Answer» 5 cubeExplanation:0.7cgs unit L for ICE is 80CAL lgm then 10 min will be 5.0
20.

a body of mass 10 kg starting from rest ,accelerates uniformly to a speed of 30m/s in 10 s. Brakes are applied on the body stops in next 5 sec. calculate the accelerating force and the stopping force​

Answer» GIVEN, m=10kgu=30m/sv=0m/st=5secAs we KNOW Force=mass×acceleration& SECONDLY acceleration=v-u/t. So, F=10kg×0-30/5F=10×6Then,F=60N
21.

a car of mass10 kg starting from rest ..accelerates to a speed of 72km/h in 20 sec..it then moves with a constant velocity for 80 sec and is brought to rest in next 10 sec, calculate tge force acting oj the car from....* 0 to 20 sec....*20 to 100sec...*100 to 110 sec​

Answer» WANT to COLLECT POINTS to ASK my QUESTION
22.

How will you distinguish between cotton wool silk and synthetic fabric?​

Answer» TION:COTTON are NATURAL but SYNTHETIC are ARTIFICIAL
23.

Give an example of an accelerated body moving with a uniform speed. ICSE Class 9 Physics Chapter Motion in One Dimension

Answer»

rning uniform CIRCULAR motion is an EXAMPLE of accelerated body with uniform speed .Artificial satellite move in a circular path but with uniform speed but also the motion is called accelerated motion because it DIRECTION ALWAYS keeps CHANGING .

24.

Why meter length in term of wave length of light is considered more accurate? ICSE Class 9 Physics Chapter Measurements and Experimentation

Answer» TION:why metre link in the term of wave of LAMP is LIGHT is CONNECTED more accurate ISC class 9 physics chapter measurement and explanation in the book
25.

Give a brief description of SI system? ICSE Class 9 Physics Chapter Measurements and Experimentation

Answer»

The International System of UNITS (SI, abbreviated from the French Système international (d'unités)) is the modern form of the METRIC system, and is the most widely USED system of measurement. ... The most recent DERIVED unit, the katal, was defined in 1999.

26.

Express the relationship between C.G.S and S.I units of density. ICSE Class 9 Physics Chapter Measurements and Experimentation

Answer» DENSITY is mass divided by volume, which is mass divided by the cube of length. ... THEREFORE, density in cgs units must be expressed as a number of grams PER cubic centimeter (symbol g/cm³). In SI mass and LENGTHS have base units: KILOGRAM and meter, respectively.
27.

To what number of significant figures is the addition or substraction of several measured quantities expressed? ICSE Class 9 Physics Chapter Measurements and Experimentation

Answer»

2 NUMBER of signification FIGURATIVELY ADDING and SUBTRACTION server by their QUALITY

28.

a bullet fired against window glass pane make a hole in it without any crack while a stone striking against same glass plane smash on it . it explain with reason​

Answer»

The AREA of CONTACT is less for a BULLET and HENCE the point pressure is more.This results in no CRACKS on the glass.wheras,when a stone is thrown,the area of contact is more resulting in cracks appearing.Explanation:Lesser the area,the more the point pressure.hope it helps and plsmark as brainliest:)

29.

What is the SI unit of weightplease answer properly​

Answer»

he S.I. unit of weight is NEWTON (N).hope it helps ☺️

30.

What is Archimedes principal ? and how it is used ?​

Answer»

tion:ARCHIMEDES' principle is also used in designing ships and SUBMARINES. The floating of a big SHIP is based on the Archimedes' principle. An iron nail sinks because it has more weight than the weight of the water it displaces. In other words, the DENSITY of the iron nail is GREATER than the density of water...Hope it will help u..Thanks❤❤❤❤

31.

explain why it is easier to knock down a boy who is standing on one foot than one who is standing on two.​

Answer» UR QUESTION is INCOMPLETE MATE
32.

Explain why one leans forward while climbing up a hill.​

Answer»

The person leans forward in order to keep himself in stable equilibrium. By leaning forward, he INCREASES the base of the support, so that the vertical line passing through his centre of gravity MAY fall within the base. For SIMILAR REASONS, a man has to bend backward while climbing down a HILL.

33.

the gravitational force on a body of mass 1.5kg situated at a point is 45N. The gravitational field intensity at that point is​

Answer» FORCE = mass ×GRAVITY    45 N      = 1.5 X gravity  therefore gravity = 45÷1.5=30 m/s² MARK brainliest.
34.

Explain briefly what causes the twinkling of star at night​

Answer»

explain briefly what causes the twinkling of stars at nightResults in Englishसंक्षेप में क्या रात में सितारों की जगमगाहट का कारण बनता है समझानेहिन्दी में नतीजेSearch ResultsFeatured SNIPPET from the WEBTHE twinkling of stars in our night sky is due to Earth's ATMOSPHERE. Stars twinkle as the light from the stars gets retracted by the movement of the AIR the atmosphere. This refraction causes slight CHANGES in the brightness and position in the star'simage , causing the twinkling of stars .

35.

Can light be piped like sound in a doctor's stethoscope​

Answer»

Yes, light can be pipedfrom one end to the other with LITTLE loss by ALLOWING it to enter one end of a rod of TRANSPARENT MATERIAL.

36.

what is the difference in the colours of the sun observed during sunset sunrise and noon? give explanation for each.​

Answer» TION:In morning sun looks light yellow at NOON or SUNSET it looks orange or RED
37.

How to generate free electricity by mangte?​

Answer»

Yep, just as we can make magnets from ELECTRICITY, we can also use magnets to make electricity. ... If you MOVE a magnet QUICKLY through a COIL of copper WIRE, the electrons will move - this produces electricity

38.

16. A ball is thrown vertically upwards and reaches a maximum height in 3 sec Calcula a. The velocity with which it was thrown upwards.b. Maximum height attained by the ball.​

Answer»

a is 30 and B is 135 Explanation:t=u/g that is 3sec=X/g g= 10 so x =30 s=ut+1/2at*2 u=30 t=3 a=10 so s=30×3+1/2×10 3*2 =135

39.

What type of force is acting when a tornado comes ​

Answer»

Centripital forceExplanation:When the tornado is FORMED,the WINDS START spinning.By this ,we can conclude that the Tornado has centripital force.hope it helps:)

40.

A) An object of height 5em is placed at 30 cm distance on the principal axis in front of a concave mirror of focal length 20cm. Find the imagedistance and size of the imageU-30- 200​

Answer»
41.

ABCD is a straight line such that AB is equals to BC, BC equal to CD. A car travelled with a speed of 40Kmph from A to B and with speed of 60Kmph .its average speed in the journey from A to C and A to D​

Answer»

,here is your ANSWERMARK ME AS BRAINLIEST IF YOU LOKE MY SOLUTION

42.

Q. 1.State the following quantity is a scalar or vector? (i)Pressure. (ii)Force. (iii)Momentum. (iv)Energy. (v)Weight. (vi)Speed.​

Answer»

1.scaler,2.vector,3.scalar,4.vector5.scalar,6.vector

43.

A body moving along a straight line at 20m/s undergoes an acceleration of -4m/s² calculate a- The speed of the body after 2 sec b- Distance covered by the body to stop.

Answer»

+at v=20+(-4)2 =20-8=12m/s

44.

The force between two charges is 900N. If the distance between the charges becomes three times, the force will be what? ​

Answer» FORCE will BECOME 100N MARK for BRAINLIEST
45.

Why does 2kg iron causes severe damage on hitting the head than 2kg cotton. Pls answer fast. The person who will answer correct I will mark him brainliest

Answer» EXPLANATION:Because it is SOFTER and IRON is HARDER so it will HURT more
46.

Aball is dropped downwards , after 1 sec another ball is dropped downwards from the same point . What is the distance between them after 3sec ?​

Answer» SEE PHOTOS as your ANSWER. I HOPE it will HELP you.
47.

A projectile of a mass m is thrown with a velocity v with an angle 60 with the horizontal. Nelecting air resistance ,the change in momntum from the depature A to its arrival at B, along the vertical direction is​

Answer» CHANGE in MOMENTUM...2mvsin 602 MV √3/2√3 mvHope it HELPS!!!
48.

Iv) The wire of length L and resistance R is stretched so that its radius of cross-sectionis halved. What is its new resistance?(A) 5R (B) 8R(C)4R(D) 16R​

Answer»

tion:B option is your right answer BCZ R ia DIRECTLY proportional to length.plz follow me

49.

Sperical mirror is cut in half horizontally will an image be formed by the bottom half of the mirror how

Answer»

when mirror is CUT HALF horizontally then only the aperture area will become half there is no change in RADIUS of curvature. so as we cut the mirror horizontally the focal length will not change and HENCE the mirror will again form the IMAGE at same position as it was formed initially. Please mark as brainlist

50.

Difference between osmosis and diffusion in a tabular form

Answer» L HOPE above table help you friend. mark me BRAINLIST.