Multiple Choice Question on Basic Concept of Science Class X Standard Practice Test 10

By Global Rail Network on July 26, 2015

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

Sr No	Question	Answer	Remarks
1	The fixed end of the spring balance is fixed on the wall and another end connected to another spring balance which is pulled with a force of 50 N. The deflection on each spring will be	25, 25	The force exerted on the each of the spring is equal and opposite to each other called action and reaction force in compliance to Newton’s third law of motion.
2	The central role played by the nucleus of a human body cell is in	cellular reproduction	The nucleus plays a central role in cellular reproduction, the process by which a single cell divides and forms two new cells. It also plays a crucial part, along with the environment in determining the way the cell will develop and what form it will exhibit at maturity, by directing the chemical activities of the cell.
3	Energy required to melt	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.
4	Find the distance travelled by a train starting from rest in 50 sec of which acceleration for first 30 sec is 1.12 Km/hour/sec and next 20 sec by 0.9 km/hour/sec.	190 m	Convert acceleration SI units i.e. 1.12 Km/hour/sec = 1.121000/3600 m/sec/sec or 0.311 and 0.91000/3600=0.25 m/sec/sec. S=1/2[0.3113030+0.252020]or 1/2[279.9+100] = 190 m
5	Cream is separated from milk by the process of	churning	Boiling leaves khoya, filtration no effect, churning makes the heavy particle to separate out and distillation is similar to building
6	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
7	What happens to speed of sound when it changes its media from air to water?	increases	The speed of sound increases because it travels due to transfer of energy from molecule to another. In water, the molecules are closely held.
8	The audible range of sound for human beings is between	20 Hz-2000 Hz	The hearing range of normal human being is 20 Hz to 2000 Hz. Children of age 5 years can hear sound up to 25 KHz.
9	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
10	The process of nitrogen fixation by bacteria does not take place in the presence of	The process of nitrogen fixation by bacteria does not take place in the presence of
11	Ozone depletion in the outer atmosphere will result in	passage of ultra violet rays of the sun to earth
12	How the intensity of sound varies when the distance between the source and ear is doubled?	becomes one fourth	The intensity of sound varies with distance as I=P/4πr2
13	A person is walking on a frozen lake and suddenly hears cracking sound of the ice. What is the same best same option for the person?	to lie flat on the ice and crawl towards the bank	The most important requirement is to reduce the pressure on the frozen ice to prevent further cracking of the ice. By lying down, the pressure or force at a point reduces thus preventing a chance to reduce chance of further propagation of cracking. The effective pressure on the ice is minimized through option 4.
14	An object weighing m kg moving with a velocity of v on application of force N Newton, the momentum of the object will be	mv	Multiplication of mass with the velocity is called the momentum of the object. The application of force will result in change of its velocity and change of momentum
15	The cells organism which lack a nuclear membrane are called	prokaryotes	In some organisms such as bacteria, the nuclear region is poorly defined due to absence of nuclear membrane and are called prokaryotes. The cells having a nuclear membrane are called eukaryotes.
16	Dry ice is	solid carbon dioxide	Carbon dioxide stored at very high pressure in solid state which gets converted directly to gaseous state on decrease of pressure to 1 atm.
17	A stone is thrown vertically upward with a velocity of 5 m/sec. How much distance it will travel if the value of g is 10 m/sec/sec?	A stone is thrown vertically upward with a velocity of 5 m/sec. How much distance it will travel if the value of g is 10 m/sec/sec?	h=v²/(2g)=25/2*10=1.25 m
18	The method used for the separation of common salt from Ammonium Chloride is	sublimation	Ammonium chloride evaporate on heating, and thus mixture is heated with ammonium chloride is collected as gas. Solubility will not work as both dissolves in water.
19	What is the chemical formula of Aluminium Chloride	AlCl3	The valance of Al is three and that of Chloride is one ; and therefore the formula of AlCl3
20	What happens to the speed of sound with increasing temperature?	increases	With increasing temperature, the molecules of air get agitated and having less inertia resulting transfer of sound signal from one molecule to another easy.
21	Ultrasound are not used for the following application	remote control	The other application of ultrasound waves is in medical application such as echo-cardiograph and getting images of internal organs of human beings and measurement of distance, direction and speed of under water objects.
22	How the mass number which is an integer represents the mass number of chlorine which is taken as 35.5?	due to existence of isotopes in the ratio of 1:3	Chlorine exists freely with isotopes of 35 and 37 mass number in the ratio of 1:3; and thus average mass number is 35.5 when a sample is taken.
23	Which of the following is not a green house gas?	Which of the following is not a green house gas?
24	What happens to the size of the air bubble rising from bottom of the pool towards top of the pool?	size increases	The external pressure reduces as the bubble goes up, therefore internal pressure results in increasing the size of the bubble
25	The vibrations of sound wave are amplified by three bones of which two are called hammer and anvil. Name the third one	stirrup

Post a Reply to Mahesh Kumar Jain Cancel Comment

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Rashi Chourasia says:

July 27, 2015 at 6:11 pm

Their is no options for some questions so plz fix it otherwise very helpful and knowledgeable

Reply
- Mahesh Kumar Jain says:
  
  July 28, 2015 at 12:07 am
  
  I am unable to get your question. The options are given for each question. However, the remarks is only for few where I considered it relevant. Every where it is not so relevant and the correct answer is a fact. Thanks for your comment and if you like it, recommend it to your friends.
  
  Reply
  - Rajanikant sharma says:
    
    July 28, 2015 at 6:50 pm
    
    Respected sir…que no. 17 Not having any option kindly fix the problem so that we can better utilize this platform…thnk you
    
    Reply
    - Mahesh Kumar Jain says:
      
      July 29, 2015 at 2:44 am
      
      Thanks for your advice. It is corrected and now the question is at serial no. 1 instead appearing at sl no. 17 earlier.
      
      Reply
LAXMAN says:

March 31, 2018 at 6:34 am

Good

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