685 + Interview Questions in Physics in Class 6 Page 12 InterviewSolution

551.	Choosethe incorrect one form the following in case of a pinhole camera .
Answer» It works on the principle of rectilinear PROPAGATION of light If the SIZE of hole is decreased, then the image formed is more clear. If the size of hole is increased, then the image becomes blurred due to supper-position of light. Pinhole camera is also known as camera obscure (dark CHAMBER). SOLUTION :If the size of hole in a pinhole camera is decreased , then the image becomes blurred.

Discussion

552.	Cathode of a dry cell is _____.
Answer» INSULATOR Iron Graphite Silver Answer :C

Discussion

553.	Suresh carried a bag containing 25 mangoes from the ground floor to the 5^(th) floor by distributing 5 mangoesat each floor . If he starts distributionfrom the first floor and each mango weighs 200 g . Then calculate the total work done by the person. (Height of each floor is 4 m , g = 10 ms^(-2))
Answer» 600 J 1600 J 1000 J 60 J Answer :A

Discussion

554.	mg , g , kg are ?
Answer» SOLUTION :UNITS of MASS

Discussion

555.	The only movable bone in the skull is
Answer» Lower jaw UPPER jaw Cheek bone Nasal bone Solution :All are IMMOVABLE bones in the skull except lower jaw. HENCE, the correct OPTION is (a).

Discussion

556.	How can you say that the tree on the earth is in a state of rest and in a state of motion at the same time?
Answer» SOLUTION :With respect to us, TREES on the EARTH are in a state of rest but with respect to other planets, trees on the earth are in a state of motion as the earth rotates AROUND its own axis.

Discussion

557.	The brass cap of dry cell is
Answer» NEGATIVE terminal Positive terminal Cathode Both (a) and (C) ANSWER :B

Discussion

558.	……………. System gives protection to inner delicate organs.
Answer» ANSWER :SKELETAL

Discussion

559.	Hari is studying in 6th standard and is interested in science related experiments. While reading simple machines topic from his text book,he started wondering as to which lever a pen belongs to in its writing position? The length of the pen he is using is 14 cm and he holds it at distance of 4 cm from its nib. If the force applied by Hari to write is 0.02 N, the mechanical advantage of the pen is _____ and it is acting as a _____order lever.
Answer» 5, second 0.25, first 2.5, THIRD 0.243, third Solution : A pen acts as a third ORDER lever in writing position (SINCE the effort is APPLIED at the MIDDLE of the fulcrum and the load). The length of pen=load arm=14 cm Effort arm 10=cm Mechanical advantage of pen `=("effort arm")/("loada arm")` `=(10)/(14)=0.243` Hence, the correct option is (d).

Discussion

560.	The property of attracting iron by a magnet is called________
Answer» ANSWER :MAGNETISM

Discussion

561.	Distinguish between metals and non-metals with respect to the following characteristics. (a) Melting and boiling points (b) conductivity(c) Malleability.
Answer» Solution :(a) Metals have HIGH melting and boiling points while non-metals have low melting and boiling points. (b) Metals are good conductorsof HEAT and electricity whereas non-metals are generally bad CONDUCTORS of heat and electricity. (c) Metals are highly MALLEABLE whereas non-metals are non-malleable.

Discussion

562.	How can you increase the mechanical advantage of a see-saw withouttheir changing its length?
Answer» SOLUTION : By INCREASING the EFFORT arm we can INCREASE the MA of a see-saw as it is a first order LEVER.

Discussion

563.	When two plane mirrors are at the angle 'theta' with each other, the number of images formed are (formula) _____ for odd number of image, _____ for even number of images.
Answer» ANSWER :`((360)/(THETA)); ((360)/(theta)-1)`

Discussion

564.	The nature of image obtained in pinhole camera is_____.
Answer» ANSWER :NEITHER a PERFECT IMAGE for nor a perfect SHADOW.

Discussion

565.	Fuse wire is made of an alloy of
Answer» TIN and lead Copper and lead Tin and copper Lead and iron Answer :A

Discussion

566.	What are the uses of insulator ?
Answer» Solution :Uses fo INSULATOR : (a) It is used to KEEP ourselves SAFE from electricity. (b) It is used to make HANDLES and the outer body of the electrical appliances.A

Discussion

567.	When you come out of an AC car, foggy apperance is noticed on the spectacles. Give reason.
Answer» Solution :The temperature remains very low in AC CAR. The spectacle glasses also remain very cool. When the person at once GETS our of the car, the water vapour in the atmospheric air COMES in CONTACT with the spectacles: it cools down and condenses forming very small TINY water droplets. this results in foggy appearance on the spectacles.

Discussion

568.	Identify the liquid non-metal among the following
Answer» Mercury Iodine BROMINE None of these Solution :Bromine is the liquid non-metal. Hence, the CORRECT option is (C).

Discussion

569.	Convert the unit of ratio ("mass "xx" area")/("volume") from SI system to CGS system.
Answer» Solution :`("Mass"xx"AREA")/("Volume")` `=("kg m"^(2))/(m^(3)) = "kg m"^(-1)` CONVERTION into CGS unit `kg m^(-1)` `=10^(3) g xx (10^(2)cm)^(-1) = 10^(+1) "g cm"^(-1)`

Discussion

570.	Which among the following elements is abundant in human body?
Answer» Iron Calcium Oxygen CARBON. SOLUTION :Carbon is the most ABUNDANT element in human body. HENCE, the CORRECT option is (d).

Discussion

571.	Length, Mass, Temperature are ?
Answer» SOLUTION :PHYSICAL QUANTITIES

Discussion

572.	On a block of mass 10 kg a child applied a force of 5 N .Explain the position of block and kind of friction acts on it .
Answer» Solution :No, the block does not move because for 5 N applied FORCE the same amount of static friction force acts on the body in opposite DIRECTION. Therefore, the net force ACTING on the body is ZERO

Discussion

573.	Dev is a 12-year-old, studying in 6th class, and has a younger brother Surya whose age is 7-years. Surya is playing by dipping balls in water tub. Dev observed that the level of the water increases when Surya starts dipping the balls one after the other in the water. Then Dev remembered his 6^(th) class topic measurement of volume. He poured water up to the brim of the tub and set up another bigger tub at the bottom of the first tub. He then asked his brother Surya to dip ten identical balls in it so that the overflowed water is collected in the tub at the bottom. Dev calculated volume of overflowed water and found that it was 2 litres. Dev calculated volume of each ball.Which of the following options matches with Dev's calculations?
Answer» 2000 L 200 l 20 l 0.2 l Solution :VOLUME of ten BALLS = the volume of overflowed WATER. 10 `xx` volume of each ball = 2 l. Volume of each ball = 0.2 l. Hence, the correct option is (d).

Discussion

574.	When the two plane mirror are parallel to each other, then the number of images of an object placed between them is
Answer» ANSWER :INFINITY

Discussion

575.	The dust particles come into air from a number of sources . Givesome examples for such sources.
Answer» Solution :Blowing of wind , TRAFFIC on the roads , dusting at home ,earth moving OPERATIONS CONSTRUCTION ACTIVITIES and AGRICULTURAL particles are the sources of dust particles.

Discussion

576.	___ is the process of change of the liquid state into vapour state.
Answer» SOLUTION :Evaporation is the process of CHANGE of the LIQUID STATE into vapour state.

Discussion

577.	The material will act as good conductor of electricity if it has more number of _____ .
Answer» FREE neutrons Free protons Free positrons Free electrons Answer :D

Discussion

578.	A diverging beam of light forms ____ image.
Answer» ANSWER :A VIRTUAL

Discussion

579.	A mixture contains camphor powder, sand, iron powder and common salt, Identify the separation methods that are employed to separate the constituetns from the mixture.
Answer» MAGNET separation, sublimation, ADDITION of WATER followed by FILTRATION, evaporation. Handpicking, sieving, addition of water followed by filtration, evaporation. Magnet separation, sieving,addition of water followed by filtration, evaporation Magnet separation, sublimation, sedimentation and decantation, evaporation. Solution :Iron powder is separated by using magnet. Camphor powder is separated by sublimation. Water is added to the remaining mixture. Sand being insoluble in water, it can be separated by filtration. Common salt from water is separated by evaporation. Hence, the correct OPTION is (a).

Discussion

580.	If an inclined plane of length 2 m is used to lift a load of 20 N to a height of 1 m, find the effort required to lift the load to that heiht using inclined plane.
Answer» Solution :`MA=(L)/(h)=(2)/(1)=2` `MA=(L)/(E)` `E=(L)/(MA)=(20)/(2)=10` Effort =10 N

Discussion

581.	Does anybody exsit without and force acting on it ?
Answer» Solution : No, a body can exist with zero net FORCE ACTING on it. Here more than two forces ACT on it but the RESULTANT of all the forces can be zero.

Discussion

582.	Sodium is a soft metal and chlorine is a gaseous non-metal but soidum chloride is a brittle solid. Give reason.
Answer» Solution :Sodium and chlorine combine chemically to form sodium CHLORIDE which is a compound. In a compound, the CONSTITUENT elements do not RETAIN their PROPERTIES. Therefore, sodium chloride GETS a new set of properties which is completely different from sodium and chlorine.

Discussion

583.	Mention the similarity and difference between rusting and burning .
Answer» Solution :Both RUSTING andburning REQUIRE oxygen . Theyare oxidation REACTIONS . But, rusting is a SLOW and natural PROCESS while burning is a fast process . It is not a natural process as it takesplaceonly on ignition.

Discussion

584.	A string is wound around a pencil 20 times and the total thickness of the turns is found to be 2 cm and 5 mm. What is the thickness of the string?
Answer» ANSWER :10.25 MM

Discussion

585.	For _____ order lever, mechanical advantage (MA) is always greater than 1.
Answer» ANSWER :II

Discussion

586.	Choose the correct one
Answer» `KM GT MM gt CM gt m` `km gt mm gt m gt cm` `km gt m gt cm gt mm` `km gt cm gt m gt mm` ANSWER :kmgt>cm>m>mm

Discussion

587.	_____ and _____ are the most abundant elements present in the earth's crust.
Answer» Solution :OXYGEN and SILICON are the most abundant ELEMENTS PRESENT in the earth's crust.

Discussion

588.	Differentiate between (a) Respiration and Combustion.
Answer» Solution :`{:("Combustion","RESPIRATION"),("Fast process","Slow process"),("Takes PLACE at high TEMPERATURE.","Takes place at body temperature."),("Catalysts are not essential.","Enzymes are essential."),("Energy is released in the from of hear and LIGHT.","Energy is released in the from of heat only"):}`

Discussion

589.	{:("Across",,"Down"),(2. "The process of coating of thin layer of zine on iron",,1. "The full form of LPG"),(6."The full form of CNG",,3."Lime water is the solution of "),(7."The inactive component of air",,4."Greenhouse gas"),(9."The process of coating of thin layer of tin on iron",,5."The gas essential for photosynthesis"),(10."Air is considered as",,6."The green pigment required for photosynthesis is"),(12."The process of burning of a substance in the prence of air",,8."The slow conversion of iron into its hydrated oxide is "),(13."With increase in height the percentage of oxygen in air______.",,10."Carbon dioxide turns lime water"),(,,11."The gas essential for combustion"):}
Answer» Answer :`{:("Across",,"Down"),(2. "Galvanization",,1. "Liquefied PETROLEUM Gas"),(6. "Compressed NATURAL Gas",,3. "Calcium hydroxide"),(7."Nitrogen",,4."Carbon DIOXIDE"),(9."Tinning",,5."Carbondioxide"),(10."Mixture",,6."Chlorophyll"),(12."Combustion",,8."Rusting"),(13."Decreases",,10."Milky"):}`

Discussion

590.	The liquids and gases together are called _____
Answer» SOLUTION :The LIQUIDS and gases together are CALLED fluids.

Discussion

591.	A mixture of chalk and water can be separated by
Answer» Sedimentation FILTRATION Loading DECANTATION. Solution :A MIXTURE of CHALK and water can be SEPARATED by filtration.

Discussion

592.	(a) Which method of separation is indicated in the above figure? (b) A mixture of two componentsX and Y X is an element and Y is a compound of two nonmetals. Identify X and Y.
Answer» SOLUTION :(a) The figure indicates the separation method of sublimation. (B) X is an element which undergoes sublimation. Therefore, it shold be IODINE. Y is SAND (silicon dioxide) which is a compound of two non-metals.

Discussion

593.	A solid X floats on water, but sinks in another liquid. And x solid Y floats on water but also floats on another liquid. A solid Z sinks both in water and also in another liquid Draw a comparison among the densities of X,Y and Z. and justify.
Answer» Solution :Since X floats on water, the density of X is less than the density of water. But the density of X in more than that of the other liquid. Solid Y floats on water and ALSO in ANOTHER liquid. That MEANS solid Y has lesser density than the other liquid also which implies that solid Y has lesser density than solid X, Z sinks in water and also in another liquid as well. which means that Z. has GREATER density than both the liquids and it is denser tan the SOLIDS X and Y. the order of densities of X,Y and Z is `ZgtXgtY`.

Discussion

594.	Define :a. static frictionb. dynamic frictionc. rolling frictiond. limiting friction
Answer» Staic friction Dynamic friction Rolling friction and Limiting friction Solution :Static friction: The frictional FORCE applied by the surface when the body is at rest is called static friction. (b) Dynamic friction: The frictional force applied by the surface when the body is in motion is called dynamic friction. (2) Rolling friction: The frictional force applied by the surface when the body is in rolling motion is called rolling friction. (d) Limiting friction: The maximum static FRIC- TION is called limiting friction

Discussion

595.	Define effort.
Answer» SOLUTION : Input force APPLIED on a SIMPLE MACHINE is called effort.

Discussion

596.	The principle of separation of a mixture depends on which factors?
Answer» SOLUTION :The PRINCIPLE exploited for the SEPARATION of the CONSTITUETNS of a mixture depends on two factors. (a) TYPE of mixture. (b) nature of constituents.

Discussion

597.	What is meant by demagnetization ?
Answer» Solution :The proces used for destroying MAGNETIC PROPERTIES of a magnet is called DEMAGNETIZATION.

Discussion

598.	______ gives light from its bio-chemical energy.
Answer» ANSWER :Glow-worm (or) FIRE FLY

Discussion

599.	The physical quantity having the same unit in all the systems of unit is ________ .
Answer» ANSWER :TIME

Discussion

600.	Air friction can be reduced by making the shape of the objects
Answer» ANSWER :STREAMLINED

Discussion

Explore topic-wise InterviewSolutions in .

Choosethe incorrect one form the following in case of a pinhole camera .

Cathode of a dry cell is _____.

Suresh carried a bag containing 25 mangoes from the ground floor to the 5^(th) floor by distributing 5 mangoesat each floor . If he starts distributionfrom the first floor and each mango weighs 200 g . Then calculate the total work done by the person. (Height of each floor is 4 m , g = 10 ms^(-2))

mg , g , kg are ?

The only movable bone in the skull is

How can you say that the tree on the earth is in a state of rest and in a state of motion at the same time?

The brass cap of dry cell is

……………. System gives protection to inner delicate organs.

The property of attracting iron by a magnet is called________

Distinguish between metals and non-metals with respect to the following characteristics. (a) Melting and boiling points (b) conductivity(c) Malleability.

How can you increase the mechanical advantage of a see-saw withouttheir changing its length?

When two plane mirrors are at the angle 'theta' with each other, the number of images formed are (formula) _____ for odd number of image, _____ for even number of images.

The nature of image obtained in pinhole camera is_____.

Fuse wire is made of an alloy of

What are the uses of insulator ?

When you come out of an AC car, foggy apperance is noticed on the spectacles. Give reason.

Identify the liquid non-metal among the following

Convert the unit of ratio ("mass "xx" area")/("volume") from SI system to CGS system.

Which among the following elements is abundant in human body?

Length, Mass, Temperature are ?

On a block of mass 10 kg a child applied a force of 5 N .Explain the position of block and kind of friction acts on it .

When the two plane mirror are parallel to each other, then the number of images of an object placed between them is

The dust particles come into air from a number of sources . Givesome examples for such sources.

___ is the process of change of the liquid state into vapour state.

The material will act as good conductor of electricity if it has more number of _____ .

A diverging beam of light forms ____ image.

A mixture contains camphor powder, sand, iron powder and common salt, Identify the separation methods that are employed to separate the constituetns from the mixture.

If an inclined plane of length 2 m is used to lift a load of 20 N to a height of 1 m, find the effort required to lift the load to that heiht using inclined plane.

Does anybody exsit without and force acting on it ?

Sodium is a soft metal and chlorine is a gaseous non-metal but soidum chloride is a brittle solid. Give reason.

Mention the similarity and difference between rusting and burning .

A string is wound around a pencil 20 times and the total thickness of the turns is found to be 2 cm and 5 mm. What is the thickness of the string?

For _____ order lever, mechanical advantage (MA) is always greater than 1.

Choose the correct one

_____ and _____ are the most abundant elements present in the earth's crust.

Differentiate between (a) Respiration and Combustion.

The liquids and gases together are called _____

A mixture of chalk and water can be separated by

(a) Which method of separation is indicated in the above figure? (b) A mixture of two componentsX and Y X is an element and Y is a compound of two nonmetals. Identify X and Y.

A solid X floats on water, but sinks in another liquid. And x solid Y floats on water but also floats on another liquid. A solid Z sinks both in water and also in another liquid Draw a comparison among the densities of X,Y and Z. and justify.

Define :a. static frictionb. dynamic frictionc. rolling frictiond. limiting friction

Define effort.

The principle of separation of a mixture depends on which factors?

What is meant by demagnetization ?

______ gives light from its bio-chemical energy.

The physical quantity having the same unit in all the systems of unit is ________ .

Air friction can be reduced by making the shape of the objects

When two plane mirrors are at the angle 'theta' with each other, the number of images formed are (formula) _ for odd number of image, _ for even number of images.

_ and _ are the most abundant elements present in the earth's crust.