Multiple Choice Question on Basic Concept of Science Class IX Standard Practice Test 3

By Global Rail Network on January 18, 2015

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.

Sr No	Question	Answer	Remarks
2	The proteins and lipids essential for building the cell membrane, are manufactured by	The proteins and lipids essential for building the cell membrane, are manufactured by
3	Velocity-time relation of any motion is given by the equation; when distance, initial and final velocity, time are s, u, v and t.	v=u+at
4	The measurement of inertia is by measurement of	mass	If inertia is not related to mass, than inertia is same for a train engine and a bullock cart which is not correct
5	An object weighs 36 g in air and has a volume of 8.0 cm3. What will be its apparent weight when immersed in water? Density of water 1000 Kg/m3.	28 gm	The density of 1000 Kg/m3 is actually 1 gm/cm3 and hence the weight of displaced water is 8 gm and the resultant weight will be 28 gm.
6	A cart rolls down a hill and gains a KE equal to velocity of 4 m/sec. If the cart is pushed with an initial speed of 3 m/sec, the speed at the end of the hill will be	5 m/sec	Initial KE=1/2m(3)2 and KE gained is 1/2m(4)2 and the total energy will be 1/2m(5)2; equal to speed of 5 m/sec
7	How is the speed of sound in solids as compared to gases?	it is more in solid	The speed of sound is more in solids varying 4700 m/s to 6420 m/s in brass to aluminium whereas it is of the order of 1284 m/sec in hydrogen, 346 in air and 213 in Sulphur dioxide.
8	Why it is difficult to make anti-viral medicine?	viruses have few biochemical mechanism and uses human cell for their process
9	CNG stands	compressed natural gas	It is a natural gas compressed to liquid state. When knob of the cylinder is opened, it evaporates and starts flowing through tube and used for burning
10	A colloidal solution is a	heterogeneous solution	A colloidal solution is similar to suspension but the particle size is very small not visible from naked eye such as milk. It is a heterogeneous solution where the milk particles can be separated out.
11	A combination where the constituents elements can be separated easily is called	mixture
12	Valancy of an element as per Bohr-Bury model is defined as the	the definite combining capacity of an element either by gaining or losing electron	Option 2 and three does not give the correct interpretation as option 2 does not answer the accepting tendency of an atom and similarly option 3 does not answer giving up tendency of electron.
13	Endocytosis is the process by which the cell membrane	gets it food from external environment	The flexibility of the cell membrane also enables the cell to engulf in food and other material from its external environment . Such processes are known as endocytosis and amoeba acquires its food through such processes.
14	Which of the following tissues has dead cells?	Sclerenchyma
15	Distance-time relation of any motion is given by the equation; initial and final velocity, time are s, u, v and t.	s=ut+1/2at2
16	The force applied on a body to result change in its motion is defined as the	All	F=m(v-u)/t or m*a and all the option is same
17	The water from a container filled with water leaks through a hole in parabolic trajectory which depends on the water coloum above the leak hole. This container now had a free fall. What happens to the trajectory of water?	it stops coming out from the container	The parabolic trajectory is due to weight of water column above the hole. During free fall the water is weightless and therefore, water will not be flowing out.
18	Rate of doing work is called	Power	Power takes into account how fast a work can be done. Unit of power is Work Done/time or Joules/sec
19	The time interval for clear hearing of echo shall be at least	0.1 sec	The sound we hear a little later is called a echo and the sensation of out speech remains in our brain for about 0.1 sec. It is therefore, necessary that the echo shall be heard after an interval of more than 0.1 sec for echo to be heart. The reflection surface shall be located at a distance of more than 17.2 m.
20	A century ago, a person who survived small pox illness makes a voluntary group to serve the person suffering with small pox why?	he has already developed resistance against the small pox virus	Virus makes a protection cell of the human body, damages it but in the mean time vaccination for the virus also get developed making the person immune towards this virus. Such person when survives, also develops immunity towards such viruses.
21	How the LPG smells?	it is odourless	LPG is odourless gas is odourless but a stench agent is added to assist in leak detection. The odorant used is Ethyl Mercaptan. Ethyl Mercaptan, which possesses a distinctive and unpleasant odour, is the odorant used . Ethyl mercaptan is also selected because it is non-corrosive, has a low sulphur content and possesses a boiling point very near that of LPG.
22	what is tyndall effect?	it is scattering of light through colloidal or suspended particle in gas or liquid.	The Tyndall effect, also known as Tyndall scattering, is light scattering by particles in a colloid or particles in a fine suspension. It is named after the 19th-century physicist John Tyndall.Vortex rings are plentiful in turbulent flows of liquids and gases, but are rarely noticed unless the motion of the fluid is revealed by suspended particles—as in the smoke rings which are often produced intentionally or accidentally by smokers.
23	What is the effect of solubility of salt in water with increasing temperature?	it remains almost constant	Solubility of salt remains almost constant at the level of 36-37 gms in 100 gm of water.
24	Mass number of an element is defined as	the sum total of proton and neutral present in the nucleus	Mass number is the sum total of proton and neutral and atomic number is the number of protons.

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