Multiple Choice Question on Basic Concept of Science Class IX Standard Practice Test 4

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This is a mock drill question bank on Basic Concept of Science of Class IX standard for those appearing in different competitive examinations. The question bank consists of 24 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. Always remember that the Mock Drill is to understand how your brain works in handling different pressure and the way distracters are constructed.

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Sr No	Question	Answer	Remarks
2	Girth of stem increases due to	lateral meristem
3	Distance-velocity relation of any motion is given by the equation; initial and final velocity, time are s, u, v and t.	v2-u2=2ad
4	A constant force of 10 N is applied to an object weighing 5 kg and moving with a initial velocity of 5 m/sec for 10 secs. What will be its final velocity?	25 m/sec	We know F=m(v-u)/t or[ Ft/m]+u=v or [1010/5]+5 = 25 m/sec
5	A 2 m cube is filled with water up to a height of 1 m exerting a force at the base of the container. A 50 Kg uniform crossection object is immersed in the tank of which 1/5 the portion floats. What will be force now at add to the base of the container?	50	There is buoyant force of 10 Kg and 40 Kg of weight which will act downward. But the reaction of the buoyant force will also be on the base therefore net additional of force will be 50 Kg.
6	A 10 kW motor works at full rating for 10 Hours working at an efficiency of 90% will consume energy of	100 kWh	10 kW motor working at full rating will draw energy of 10(kW)*10(hours)=100 kWh
7	Reverberation of sound is undesirable in a auditorium and is controlled by	using sound absorbent material
8	Rabies virus is spread through	dog bite
9	Melting point of ice is	273.16 K
10	This is not a solid-gas colloidal	butter
11	A standard to measure the atomic masses is given as	mass of 1/12th part of the mass of one atom of carbon-12 isotopes	In 1961, for a universally accepted atomic mass unit, carbon-12 isotope was chosen as the standard reference for measuring atomic masses. The relative atomic masses of all elements have been found with respect to an atm of carbon-12 atom.
12	Isotopes of an element is defined as elements having	same atomic number but different mass number	Isotopes of Hydrogen are protium, deuterium and tritium having same atomic number of one but mass number of 1,2 and 3. Similarly, carbon and chlorine has one more isotopes each 14C6 and 37Cl17. The atomic structure is written as Mass Number/Formula/Atomic number
13	Inheritance of parental features are stored in the form of DNA which stands for	Deoxyribo Nucleic Acid
14	Cartilage is not found in	ear
15	A train weighing 500T is travelling at speed of 90 Km/hour. Brakes are applied to stop the train within a distance of 1 Km. What should be the uniform de-acceleration for which brakes be applied?	0.312 m/sec2	Convert speed into SI units i.e. 901000/6060=25 m/sec, now use the formula v²-u²=2as i.e. 2525=2a*1000 or a=0.312 m/sec2.The mistakes usually done is not following the units or formula etc. Weight of the train is given as a distractor with no relevance in the answer
16	A truck weighting 7 T starting from rest rolls down a hill with a constant acceleration and travels a distance of 400 m in 20 sec. The force acting on the truck will be	14000 N	S=1/2att; we get (4002/2020) = a i.e. 2 m/sec/sec. The force acting will be ma or 7000*2=14000 N
17	Lactometer is the device used for the measurement of	purity of milk
18	What property of wave changes when it changes its media from air to water?	Speed and Time period	v=f*λ, frequency does not change and when v changes, λ will also change
19	The sound of the heartbeat of patient using stethoscopes reaches to the ear of the Doctor through	multiple reflection of sound in the tube
20	Greenhouse effect is caused by the atmospheric excess concentration of	Ozone	Carbon dioxide absorbs heat resulting into rise of temperature. If it so happens, the snow at mountain will start melting raising the level of water in the sea. The environmentalist are planning to hold the level of carbon dioxide in the environment to the level existing at the beginning of 20th century.
21	What is dry ice?	solid form of carbon dioxide	Dry ice is the solid form of carbon dioxide and primarily used as cooling agent. Its advantage include lower temperature than that of water ice and not leaving any residue. It is useful for preserving frozen foods, ice cream etc. when mechanical cooling is not possible.
22	Cream is separated from milk by the process of	churning	Boiling leaves khoya, filtration no effect, churning makes the heavy particle to separate out
23	Chemical formula of Sodium Oxide is	Na2O	The vacancy of Na is one and that of Oxygen is 2 ; and therefore the formula of Na2O
24	isobars are defined as the atoms of	different elements with different atomic numbers which same mass numbers	The atomic number of calcium and argon is 20 and 18 but both has the same mass number of 40

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