Multiple Choice Question on Basic Concept of Science Class X Standard Practice Test 2

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This is a mock drill question bank on Basic Concept of Science of Class X standard for those appearing in JE RRB examination. The question bank consists of 21 questions with clock set for 20 minutes. After you finish the test, press Quiz Finish and you will get the answer sheet, your result and its comparison with others. You will also be given remarks containing the explanation about the answer and also about the distracters (other options) to build confidence on the subject. You will also learn techniques to handle distractors because it is known only to person who has the experience of constructing multiple choice questions.
Always remember that the Mock Drill is to understand how your brain works in handling different pressure and the way distractors are constructed.Use these learning to correct your approach.

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Sr No	Question	Answer	Remarks
1	Exothermic chemical reactions are those in which	heat is released	Always remember exothermic means exhale or out and endothermic means inhale or intake
2	Pb(NO₃)₂ when heated forms the following products	PbO, NO₂, O₂	Pb(NO₃)₂ is called lead nitrate and when on heating releases the products given at option 2. The best way to find the answer is by balancing the equation.
3	pH range of human body is	6.5-7.0	pH scale is 0 to 14 with neutral at 7. Zero is highly acidic and 14 highly basic. pH of human body is slightly acidic becuase of the need of acids to consume food.
4	Bag of chips is flushed with nitrogen gas to	prevent oxidation of anti-oxidants used in the oil	Usually substances which prevent oxidization are added to foods containing fats and oil. Keeping food in air tight containers helps to slow down oxidation. This is the reason of flushing out oxygen and filling nitrogen to prevent oxidation.
5	Electrolytic process is used for extracting of metals lying	low in the activity series	Metals with very high reactivity are extracted by electrolysis of the molten ore. They cannot be extracted by heating, oxidation or reduction.
6	Unsaturated hydrocarbons with one or more double bonds is called	alkenes	Remember all single bonds – alkanes, one or two double bonds – alkenes and one triple bond – alkynes. Alkines does not exists and a distractor.
7	The formula is of functional group	ketone
8	The elements have the outermost orbit complete filled up are called	inert gases	With no vacancy to fill up the outermost orbit, the gases are unable to exchange any electrons and thus non-reactive.
9	The anther contains	pollen grains
10	The function of oesophagus is to	transport food from mount the stomach
11	The blood from the lungs is dealt in the heart in	right artrium	The blood flows from right artrium to right ventricle and to lungs. Oxygen rich blood than comes to left artrium and move to the body through left ventricle.
12	The autotrophic mode of nutrition requires	sunlight
13	In a concave mirror, the size of the real and inverted image is same, than the object if lying	at the center of curvature point
14	What type of vision correcting lens is generally required by every one in old age	convex	During old age, the near point gradually recedes away and find it difficult to see nearby objects and this defect is called presbyopia and corrected using convex lens to bring back the image on the retina which earlier was forming far away from retina.
15	The human eye forms the image of an object at its	retina	Check different parts of the eye.
16	A current of 0.5 A has passed through an incandescent lamp for a period of 10 minutes. What is the total charge passed through the lamp	300 C	Q=it; 0.5600=300 C
17	The SI unit of electrical resistivity is	Ohm-m	In case of doubt use the ρ=R*A/l to work out the unit as Ohm-m. It can be written as Ohm-cm but than it cannot be SI unit.
18	The magnetic field around a current carrying conductor will always be	in a circle around the conductor
19	The working principle of a fuse is	Joule’s Heating effect
20	Bio-mass fuels are	All	Renewable source of energy is one which can be renewed within a short period and therefore, plant (all plants incl. vegetable), animal and sewage is produced continuously in the system and a good source of energy except the reason that the quantity is less and only small power plants can be built on such system.
21	The major hazards of nuclear power generation is	All	The limitations are not only these three but includes not availability of Uranium raw material also.

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