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Multiple Choice Question on Basic Concept of Science Class IX Standard Practice Test 8

By Global Rail Network on September 1, 2015

This is a set of multiple choice questions of basic concept of general science for competitive examination

Sr No	Question	Answer	Remarks
1	In how many ways the matter is classified in modern science?	2	The matter is classified in two ways namely physical properties and chemical nature
2	Latent heat of evaporation is the energy required to change the state of	one Kg of liquid to gas state at its boiling point	Melting point is the state where the matter changes its state from solid to liquid. Kg is the mks unit system and the measurement of latent heat of evaporation of melting is in mks system.
3	What happens to the solubility of salt in water with rising temperature?	no appreciable effect	Solubility of different salts in 100 gms of water at increasing temperature from 10 to 80 degree is as follows:NaCl: Constant at 35 g, Potassium Nitrate: 21to 167 g; Potassium Chloride: 35 to 54; Ammonium Chloride: 24 to 66.
4	The chemical symbol of element Bromine is	Br	B: Boron, Bm: Nil, Ba: Barium
5	What is mass number of an atom?	sum of proton and neutrons	Atomic number is the total number of protons and mass number is the sum of protons and neutrons. Atomic number of an atom of any particle is always same but if the number of neutrons vary, it results in isotopes.
6	Which organelle is called the power house of the cell?	Mitochondria	Mitochondria are known as the powerhouses of the cell. They are organelles that act like a digestive system which takes in nutrients, breaks them down, and creates energy rich molecules for the cell. The biochemical processes of the cell are known as cellular respiration.
7	What is the function of xylem tissue?	to carry water and other minerals from the root to the plant
8	What is the function of cardiac tissue?	to pump blood in the body	Cardiac muscle tissue is an extremely specialized form of muscle tissue that has evolved to pump blood throughout the body. In fact, cardiac muscle is only found in the heart and makes up the bulk of the heart’s mass.
9	When does a human being feels a weightlessness?	accelerating downward	The feeling of weight is due to reaction from the static surface. A person standing on earth is having a weight of ‘mg’ and falls down, there is no reaction and he feels a weightlessness. Even with support, such as lift going downward with acceleration of more 1 m/sec*sec, the body will experience weightlessness.
10	Why a the fielder in the ground moves his hand backward while catching fast moving cricket ball?	to reduce the momentum of the ball slowly	If the fielder does not moves is hand backward, the momentum of the ball is changed abruptly and his hands will get hurt as the force will be rate of change of momentum. The fielder increases the time period of the ball to come at rest and thus reduces the impact felt by the hand.
11	A 200 gm. bullet is fired from 20 Kg gun at a speed of 150 m/s. What is the speed at which the gun will coiled back?	1.5 m/sec	Initial Momentum is zero. The momentum of bullet is 0.2150 and shall be equal to the momentum of the recoiled gun i.e. 20V or 1.5 m/sec
12	A swimmer swims in 60 m from one end to another and returns back in 1 m travelling a distance of total 120 m. What is average velocity?	0	While calculating velocity, direction is also to be taken. Here the net distance travelled is zero, therefore, average velocity is zero.
13	What is the meaning of weight in science?	it is the force of attraction by the earth	Mass is the fundamental unit and weight is the force with which the mass is attracted towards earth. Mass is the property provides inertia to the object. For all fundamental mechanics, it is the mass that is taken into calculation and sometime mentions as Weight also. When it is taken as a force, the unit is N equal to mass multiplied by ‘g’.
14	A 10 t boat floats in a river with water level at 2/3th of the boat. What is the buoyant force acting on the boat?	10 t	On floating bodies, the buoyant force balances with the weight of the body.
15	It is estimated that a work will require 46080*10³ J of energy. How many units of electric energy will be required for the said purpose?	12.8	3.610⁶J=1kWh; (4608010³/(3.6*10⁶)=12.8 kWh or units
16	Why is the ceiling of concert hall is curved?	for sound wave to distributed uniformly after reflection
17	Which one of the following is a infectious disease?	measles
18	Which one is a non-renewable source of energy	geo-thermal	Geo-thermal energy though available in abundance but cannot be renewed. It is similar to coal or oil but in the form water steam.
19	What is the reason behind the wind?	uneven fall of sun energy on earth and varying capacity of bodies towards heat absorption	Heat energy from sun falls differently on the earth and absorption capacity is different from place to place like water and ammonia is very high and less than for metals. This results in varying temperature and thereby making the air particles to move to equalize the temperature.
20	The factors responsible for ozone depletion are	use of man made compounds of chlorine and fluorine	The chlorine and fluorine escapes to stratosphere and results in breaking of ozone

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Multiple Choice Question on Basic Concept of Science Class IX Standard Practice Test 8

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