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651.	Find out the physical quantity in CGS unit that results on simplifying the expression 1000 (a^(2)b^(2)c^(3))/(d), where a - acceleration, b - displacement, c - time, d - velocity.
Answer» 10000 `cm^(3)` 1000 `cm^(3)` 1000 l 1000 g Solution :`1000 (a^(2)b^(2)C^(3))/(d) = 1000 cm^(3)` Hence, the CORRECT option is (b).

652.	Can we draw 100% work from the energy spent on an event ? If not , give the reason.
Answer» ANSWER :cannot DRAW 100% WORK

653.	If mechanical advantage of an inclined plane is 3 and its height is 2 m, then what will be its length?
Answer» SOLUTION :`MA=(L)/(H)` `l=MAxxh` `=3xx2=6` `:.` LENGTH =6M.

654.	Bpmes possess……..at the end to reduce friction.
Answer» ANSWER :CARTILAGE

655.	A cauboid of volume 20 mxx 10 m xx 5m has density3 kg m^(-3) .Find the maximum pressure exerted by cuboid on the surface .
Answer» Solution :Density `= 3 kgm^-3` Volume of cuboid `=1xxbxxh= 20 xx 10xx5 = 10^3 m^3` Mass of cuboid `="Density " xx "volume "` `==3xx 10^3` kg Weight of cuboid `=mg = 3 xx 10^4 N` `A_1= 200m ^2, A_2= 50m^2 ` `A_3= 100m^2` Pressue `ALPHA 1/"Area"` that means the prosition of cuboid to GIVE maximumbottom PRESSURE is `p=(3xx10^4)/(50)=0.6 xx 10^3= 600 pa`

656.	A fuse wire should have ______ .
Answer» LOW melting point and HIGH RESISTANCE High melting point and high resistance Very high melting point and low resistance None of the above Answer :A

657.	If you are using a Screwdriver to twist out a screw, they?
Answer» Solution : If you are USING a Screwdriver to twist out a SCREW, you are actually using 2 simple machines, i.e., INCLINED PLANE and wheel and axle.

658.	Identify the following. (a) The gaseous compound of two non-metals required for photosynthesis. (b) The compound of two non-metals which exists in all the three states under normal conditions. (c) The metal which breaks into pieces on the application of force. (d) The metal used in thermometers. (e) The inert gas used in advertisement sign boards.
Answer» Solution :(a) Carbon dioxide-Carbon and oxygen are non-metals. (B) Water- HYDROGEN and oxygen are also non-metals. (c) Usually metals are malleable and ductile. They do not break into pieces on the application of force. However, zinc is a metal which is not malleable. hence, it becomes brittle and breaks into pieces on the application of force. (d) Mercury is a liquid metal and is USED in THERMOMETERS. (e) Neon is the inert gas used in advertisement sign boards.

659.	_____ grams make 0.2 kilograms.
Answer» ANSWER :200

660.	Spinal cord is the most vital part in human hody.
Answer» Solution :SPINAL cord is laso called spine and is located in the backbone or vertebral COLUMN. It is a nervous tissue which gives out spinal nerves. These nerves help in giving responses by REFLEX ACTION. It is PROTECTED by vertebral column.

661.	A passenger in a moving bus appears to be in a state of rest with respect to _____.
Answer» ANSWER :ANOTHER PASSENGER

662.	_________ liquids can be separated from their mixtures by the method of distilation.
Answer» SOLUTION :MISCIBLE LIQUIDS CA be separated from their mixtures by the method of distillation.

663.	The condensation point of steam is__
Answer» `0^(@)C` `100^(@)C` `120^(@)C` `150^(@)C` Solution :Condensation POINT of STEM is `100^(@)C` Hence, the correct OPTION is (b)

664.	Observe the figure given below and answer the following questions.(a) Will the observation be same in both the flask ?(b) What inference can be drawn from the given experiments?
Answer» Solution :Lime water in both the FLASKS turns milky , but the EXTENT of MILKINESS is more in flask B than that in A. Exhaled AIR contains more carbon dioxide than normal air.

665.	Roller skates, Rolling pins, Knife, Skateboard
Answer» SOLUTION :EXAMPLES of WHEEL and AXLE

666.	Select the correct alternative from the given options .Who named the active component of air as oxygen?
Answer» Cavendish Mayow Lavoisier Priestley Solution :Lavoisiter NAMED the ACTIVE COMPONENT of AIR as OXYGEN.

667.	The cotton yielded from the crop of a farmer is given below. Find the average mass of cotton yielded per week. Week 1 - 20 quintalsWeek 2 - 15 quintals Week 3 - 12 quintals
Answer» SOLUTION :AIM: To measure the diagonal length of your TV screen in inches. Apparatus: Scale Procedure: Take a metre scale. Measure the length of the diagonal of screen in CENTIMETERS. CONVERT the reading in terms of inches. If 1 inch = _____ centimeters. The diagonal of the screen = _____ cm = _____ inches.

668.	A _________ is the smallest unit of a compound.
Answer» SOLUTION :A MOLECULE is the SMALLEST UNIT of a COMPOUND.

669.	The northk and south poles of a bar magnet are situated 0.4 cm inside from the geometric ends of the magnet. If the geometric length of the magnet is 6 cm, then its effective length is ________ mm.
Answer» 48mm 52mm 56mm 54mm Solution :Geometrical length of the magnet =6 cm. THEREFORE, EFFECTIVE length of the magnet`=6-(2xx(0.4))` `=5.2 cm ` `=52mm`. Hence , the CORRECT OPTION is (B).

670.	See-saw is an example of ______ order lever.
Answer» ANSWER :I

671.	find the surface area of a cube ,if side of cube is 1.5m?
Answer» SOLUTION :NA

672.	The ultimate source of energy in an ecosystem is:
Answer» Bio-gas SOLAR ENERGY FOSSIL fuels All of these Answer :B

673.	Select the correct alternative from the given options .GasX toCombustible and not a supporter of combustionGas toCombustible as well as a supporter of combustion . What could be X and Y ?
Answer» X `to`OXYGEN , Y `to ` Nitrogen X `to` CARBON DIOXIDE , Y `to` Oxygen X `to` Oxygen , Y `to`Carbon dioxide X `to` Carbon dioxide , Y `to` Argon Solution :X is carbon dioxide and y is oxygen.

674.	Which among the following substances fills up the entire space in the container?
Answer» Oxygen Water Oil Naphthalene Solution :Oxygen being a GAS FILLS up the entire space in the container.Hence, the CORRECT OPTIN is (a).

675.	Among the following, which is a metalloid?
Answer» Antimony Carbon Iodine Mercury Solution :Antimony is a METALLOID among the GIVEN ELEMENTS. Hence, the correct OPTION is (a).

676.	MCB stands for _____.
Answer» MINUTE CIRCUIT breaker. Miniature CAPACITY breaker Miniature circuit breaker Minimum CURRENT breaker Answer :C

677.	(a) What are the advantages of electicalmethod of magnetization ? (b) What are the uses of electromagnets ?
Answer» Solution :(a) (i) They can be easily magnetized or demagnetized by turning the current on or off in the COIL. (ii) They can be made stronger than any other permanent magnet. (iii) Poles of an ELECTROMAGNET can be interchanged by reversing the direction of the current. This is not possible in case of permanent magnet. (iv) Increase in the amount of current passing through the coil increases the strength of the electromangnet. (v) Increase in the number of turns of coil increases the strength of the electromagnet. Uses of electromagnets: (i) LOADING or unloading heavy loads at shipyard, COLLECTING the IRON pieces from the scrap, etc. (ii) Used to remove samll bits of iron lodged in the eyes. (iii) Used to show directions. (iv) Used in electric bells, loud speakers, motors, etc. (v) Used in galvanometer, voltmeter and ammeter.

678.	What is the role of biceps and triceps in lifting weight ?
Answer» SOLUTION :BICEPS and TRICEPS are the muscles of upper arm. Biceps are located in front of the upper arm, when they contract, the DISTANCE between forearm and upper arm decreases. Triceps are located at the BACK of the upper arm. When they contract, the elbow is extended, increasing the distance between upper arm and fore arm.

679.	Find the unit of ratio of area to length.
Answer» SOLUTION :`("AREA")/("LENGTH") = (m^(2))/(m) = m`

680.	Time is a fundamental quantity
Answer» SINCE it is INDEPENDENT of other quantities. Since it is measured in SECONDARY scale. Since it is dependent on other quantities. Since it DEPENDS on the mass of the clock. Answer :A

681.	Consider a magnet which is hung to the hook of a spring as shown in figure. Then what could be the possible option from the following? (i) X,A are North Pole and Y,B are south Pole (ii) X, B are North Pole and Y,A are South Pole (iii) A,B are South Pole and X,Y are North Pole (iv) X,A are South Pole and Y,B are North Pole.
Answer» Only(II) Only (i) Both (i) and (ii) Both (ii) and (iii) SOLUTION :In a pair of magnet, like poles repel and unlike poles attract each other. ACCORDING to the figure, Y and A should be same poles. Since the DISTANCE has decreased from 15 cm to 10 cm, this MEANS that A is repellying y. Thus, X ,B are North Pole and Y, A are southPole.

682.	Mercury level in a thermometer changed from 10^@ C to 20^@C. If 0.5 Pa pressure is increased in average per each degree rise in temperature, then express the change in average thrust acting on the walls of container between these temperatures in terms of thrust at 10^@C and the area of cross sec tion ofcapillary tube is uniform (Consider average pressure at 10^@ C as 5 Pa ).
Answer» Solution :Area (A) = cosntant INCREASE in `10^@C` of temperature , the PRESSURE increased is `10 xx 0.5 = 5 Pa` `P_(10^@)c = F_(10 ^(@)C)/A,P_(20^(@)c)=(F_(2^(@)C))/Aj` `F_(10)/P_(20)=(F_(20))/(P_(20))P_(10)=5 Pa, P_(20)= 10 pa` `F_(10)/P_(20)=(F_(20))/(P_(20))=5/10= 1/2` `2F_(10)=F_(20),F_(20)-F_(10)= 2F_(10)-F_(10)=F_(10)` The change in thrust at `10^(@)`C

683.	________ is a transparent homogeneous medium.
Answer» ANSWER :GLASS

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