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301.

Roopa observed that her mother is using a cutting plier instead of fire tongs to hold a hot container and she prevented her from doing so. Why?

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Solution : Because, to HOLD hot containers SPEED MULTIPLIERS are needed but not force multiplier. Here, fire tongs is a speed multiplier but cutting plier is a force multiplier.
Discussion
302.

If a bus moves from A to B and comes back to A, find the displacement and velocity of the body.

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SOLUTION :As the BUS comes back to the initial POSITION, its DISPLACEMENT and velocity are zero.
Discussion
303.

Name the gaseous non-metallic elements and the solid non-metallic elements.

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Solution :FLUORINE, chlorine, hydrogen, nitrogen, OXYGEN are the gaseous non-metallic elemetns. Carbon, SILICON, sulphur, phosphorus and iodine are the SOLID non-metallic elements.
Discussion
304.

Prefix used for factor 10^(-6) is _____.

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ANSWER :MICRO
Discussion
305.

Irrespective of shape, all magnets have_____

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Only the NORTH POLE
Only the South Pole
A LARGE number of poles
Both the North Pole and South Pole .

Answer :D
Discussion
306.

Select the correct alternative from the given options .Major component ofCNG is _______

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Butane
METHANE
Ethane
Propane

Solution :MAJORCOMPONENT of CNG is methane.
Discussion
307.

Identify the bony framework connecting the chest bone and backbone.

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Vertabrate
Muscles
Diaphragm
Ribcage

Solution :The bony FRAMEWORK connectingchest bone and BACKBONE is ribcage.
HENCE, the correct option is (d).
Discussion
308.

Breaking of bones is known as fracture.

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SOLUTION :1
Discussion
309.

Differentiate between residue and filtrate.

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SOLUTION :During the process of FILTRATION, the INSOLUBLE solid left on the filter is CALLED RESIDUE while the liquid which passed through the filter is called filtrate.
Discussion
310.

What is meant by a fused bulb ?

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Solution :BULB is said to be fused when its filaments is broken. Broken filament cannot complete the CIRCUIT, THEREFORE a fused bulb does not glow.
Discussion
311.

Twoliquids A and B when mixed together formed two layers. Liquid C when added to B also formed two layers. However, A and C when mixed formed a single layer and also with water. How do you account for this?

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SOLUTION :As A and B when mixed TOGETHER formed two LAYERS, A and B are immiscible liquids Similarly, B and C are ALSO immicible liquids As A and C formed a single layer on mixing, they are mischible liquids. As they formed a single laeyr with water, A and C are muscible with water while B is an OILY liquid as it is immiscible with A and C, and hence with water.
Discussion
312.

The process by which a gas chagnes into its liquids tate is called _________ .

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SOLUTION :The PROCESS by which a gas CHANGES into its LIQUIDS state is called condensation.
Discussion
313.

Identify the substances which undergo sublimation.

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Incense stick and camphor
PERFUME and DRY ice
Perfume and incense stick
ODONIL and dry ice

Solution :Odonil and dry ice UNDERGO sublimation. HENCE, the correct option is (d).
Discussion
314.

Derive the units of area and volume.

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Solution :AREA = LENGTH `XX` Length
`m xx m`
`= m^(2)`
VOLUME = Length `xx` Length `xx` Length
`= m xx m xx m`
`=m^(3)`
Discussion
315.

The shape of six's maximum and minimum thermometer is in the shape of the English alphabet _____.

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ANSWER :U
Discussion
316.

The gas necessary for combustion is ____________.

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SOLUTION :The GAS NECESSARY for combustion is`UNDERLINE( "oxygen").`
Discussion
317.

Find the area of a coloured paper used to stick to a sphere of radius 7 cm.

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SOLUTION :TSA = `4pir^(2)`
`=4 xx (22)/(7) xx7^(2)`
`= 616 CM^(2)`
Discussion
318.

Frictional force causes

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WEAR and TEAR of a machine
Energy LOSS in the form of heat
Motion in a body
Both (a) and (b)

Solution :FRICITON itself a FORCE which opposes the relative motion so it cannot bring a body into motion
Discussion
319.

The smallest measurement that can be measure by using a wall clock is _____.

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ANSWER :1 SECOND
Discussion
320.

Efficiency of an ideal machine is _____.

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0
0.5
0.9
1

Answer :D
Discussion
321.

During reflection of light ______, ______ and _____ remains constant but _____ changes.

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Answer :Wavelength, VELOCITY , frequency, INTENSITY (or) BRIGHTNESS.
Discussion
322.

What is meant by dipole in magnetism?

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SOLUTION :Two poles, i.e., the NORTH Pole and the SOUTH Pole separated by some distance is CALLED DIPOLE in magnetism.
Discussion
323.

Find the minimum speed required by a person standing 5 m behind a bus, to catch the bus in one minute which is moving at a speed of 600 m min^(-1).

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<P>

Solution :
`5+S_(b) = V_(P)t`
`S_(b) = 600 xx 1`
`5 + (600 xx 1) = V_(P) xx 1`
`V_(P) = 605` m `MIN^(-1)`
Discussion
324.

Skull, vertebral column, sternum, limbs.

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SOLUTION :Limbs: They are parts of appendicular SKELETON, OTHERS are parts of AXIAL skeleton.
Discussion
325.

The effort applied to lift a 60 N box using a simple machine is 45 N. Find the MA of themachine.

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ANSWER :1.33
Discussion
326.

_________ type of magnet is used in cranes to lift heavy containers from ships.

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Solution :CYLINDRICAL magnet is USED in cranes to LIFT heavy CONTAINERS from ships.
Discussion
327.

Identify a sublimable substance among the following

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Wax
ICE
DRY ice
Steam

Solution :Dry ice (solid CARBONDIOXIDE) is the sublimable substance.
Hence, the correct OPTION is (c).
Discussion
328.

Jyoti created a temperature scale, in which the reading at room temperature divides the total length of the temperature scale in 2 : 3 ratio from LFP. Then find its value on Jyothi's scale, which is the same as Kelvin scale.

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40 K
313 K
200 K
73 K

Solution :Jyothi CREATED a temperature scale in which reading at the room temperature is dividing the TOTAL length of temperature scale into `2 : 3` RATIO. The total length of Jyothi's scale is 2x + 3X = 5x
`(2x)/(5x) = (K - 273)/(100)`
`therefore K = 273 + 40 = 313` K in Jyothi's scale
Hence, the correct OPTION is (b).
Discussion
329.

Consider a magnet which is hung by the hook of a spring as shown in figure. Then what could be the possible option from the following to attain the final position shown in figure. (a) X,A and North Pole and Y,B are South Pole. (b)X,B and North Pole and Y,A are South Pole. ( c) X,B are South Pole and Y,A are North Pole (d) X,A are south Pole and Y,B are South Pole

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Solution :In the second PICTURE it is observed that the SPRING length INCREASED. This shows that the 'Y' part is attracting TOWARDS 'A', i.e., 'Y' and 'A' are oppossite poles.
Discussion
330.

Lifting of hand is by the contraction of muscles.

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SOLUTION :TRUE
Discussion
331.

If the velocity of a body decreases gradually with time, then it is said to be in

Answer»

Acceleration
Deceleration
Retardation
Both (B) and (C )

ANSWER :D
Discussion
332.

In birds, breastbones are modified to hold fight muscles and help in the movement.

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SOLUTION :1
Discussion
333.

______ acquires the volume of the container.

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SOLUTION :GASES ACQUIRE the VOLUME of the CONTAINER.
Discussion
334.

Match the entries of Column with those of Column B

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SOLUTION :`(A) to (B), (B) to (d) , (C) to (c), (D) to (a)`
Discussion
335.

Identify the gas which is insoluble in water.

Answer»

Oxygen
METHANE
Carbon dioxide
All of these.

SOLUTION :Methane is insoluble in WATER while the other gases are soluble in water.
HENCE, the CORRECT option is (b).
Discussion
336.

Define machine.

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SOLUTION : Machine is an object which ALLOWS US to do work with less effort than effort REQUIRED to do work without a machine.
Discussion
337.

Choose the correct one from the following .

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Biogas is a mixture of METHANE (65%) , carbon dioxide and hydrogen .
An apple on a tree has only POTENTIAL energy.
A compressed spring has an ELASTIC potential energy.
All the above

Answer :D
Discussion
338.

Differentitate a temporary magnets from a permanent magnet.

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SOLUTION :
Discussion
339.

In a separating funnel, the _______ liquid forms the upper layer.

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Solution :In a SEPARTING FUNNER, the lighter liquid FORMS the upper LAYER.
Discussion
340.

The number of images formed by two plane mirrors inclined at 60^@ of an object placed symmetrically between mirror is

Answer»

6
36
5
4

Solution :`theta=60^(@)`
`n=(360)/(theta)-1`
`=(360)/(60)-1=6-=5`
Hence, the CORRECT OPTION is (C).
Discussion
341.

A snail moves with the help of the shell.

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Solution :FALSE: Muscles prestnt in the foot of snail CONTRACT and expand and push the body forward.
Discussion
342.

The compression ofsofa is more when we Sit On it than when we lie on it. Why?

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Solution :
When we sit on a sofa , our total weight ACTS on a LESSER area , so the PRESSURE is more and its COMPRESSION is more .
Discussion
343.

If the spring balance graded in gravitational units (CGS syste1n) shows 20 as the reading, then mass of the body is "________" kg.

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SOLUTION :20 gf
MASS = 20 grams = 0.02 KG
Discussion
344.

Pick out the object that obstructs light.

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GROUND glass
Glass
Water
Cloud

Solution :Cloud
Hence , the CORRECT OPTION is (d)
Discussion
345.

What is the relation between CGS and SI unit of distance?

Answer»
Discussion
346.

Vinay wrote the word 'REFLECTION' on a paper and placed it in front of a plane mirror (as shown in figure) and noticed how the letters of the word appear in the mirror. Write down the mirrow image of it.

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SOLUTION :As the image FORMED by a plane mirror is laterally inverted , the image of LETTERS REFLECTION appears as shown in the figure
Discussion
347.

What are the major components of air ? Among these , which is the active component and which is the inactive component ? Giveany four characteristics of air as a mixture.

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Solution :MAJOR components of air are nitrogen and oxygen. Nitrogen is the inactive component and oxygen is the active component.
Characteristics of air as a mixture is as folloes.
(i)Variable COMPOSITION of air in different places on earth.
(ii)No netchange in energy is involved in the mixing up geses in air.
(iii) No definite boiling point for LIQUID air.
(iv)Separation of air into various components can be done by physical methods.
(v)The properties of different GASES are retained in the air.
(vi) Air has no definite chemical formula.
(VII) Air does not exhibit definite chemical properties of its own.
Discussion
348.

The volume of oxygen present in 750 l of air is ___________

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172.5 l
187 .5 l
157 . 5 l
255.5 l

Solution :PERCENTAGE by volume of OXYGEN PRESENT in 750 1 of AIR`=750xx21//100=157.51`
Discussion
349.

What are the effects of forces acting on the objects?

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SOLUTION :Force can CHANGE the state of a body, the direction of motion OFA body and SHAPE ofa body
Discussion
350.

Define time.

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Solution :DURATION between TWO events is CALLED time.
Discussion