Multiple Choice Question on Basic Concept of Science Class X Standard Practice Test 9
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This is a set of multiple choice questions of basic concept of general science for competitive examination
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Sr No Question Answer Remarks 1 Plant cell wall formed outside the cell membrane for its protection is made up of cellulose 2 How the LPG smells? it is odorless LPG is odorless gas 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. 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=2*a*d 4 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. 5 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. 6 Reverberation of sound is undesirable in a auditorium and is controlled by using fire absorbent material 7 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. 8 Girth of stem increases due to lateral meristem 9 Rabies virus is spread through dog bite 10 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. Be careful, Efficiency is only a distractor in this case. 11 Which is the smallest unit of Pressure Pascal 12 Lactometer is the device used for the measurement of purity of milk 13 A truck weighting 7 T starting from rest rolls down a hill with a constant acceleration travels a distance of 400 m in 20 sec. The force acting the truck will be 14000 N S=1/2*a*t2; we get a=(400*2)/(20*20) i.e. 2 m/sec2. The force acting will be m*a or 7*2=14000 N 14 Inheritance of parental features are stored in the form of DNA which stands for Deoxyribo Nucleic Acid 15 Melting point of ice is 273.16 K 16 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. (90*1000)/(60*60)=25 m/sec, now use the formula v2-u2=2*a*s i.e. 25*25=2*a*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 17 This is not a solid-gas colloidal butter 18 A standard to measure the atomic masses is given as mass of 1/112th 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. 19 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 20 The sound of the heartbeat of patient using stethoscopes reaches to the ear of the Doctor through multiple reflection of sound in the tube 21 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 22 Cartilage is not found in kidney 23 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. 24 What is responsible for the depletion of ozone layer CFC compounds 25 Two bricks namely A and B are placed in water at a depth of 2 m and 5 m respectively. Which brick will require more downward force to hold the brick in position? Both same The buoyant force will be same for both the bricks which is the difference between the top and bottom pressure, and therefore, the buoyant force acting on the body to be applied to keep the brick in position is same. -
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- Review
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Question 1 of 25
1. Question
Plant cell wall formed outside the cell membrane for its protection is made up of
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Question 2 of 25
2. Question
How the LPG smells?
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Question 3 of 25
3. Question
Distance-velocity relation of any motion is given by the equation; initial and final velocity, time are s, u, v and t.
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Question 4 of 25
4. Question
what is tyndall effect?
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Question 5 of 25
5. Question
What is the effect of solubility of salt in water with increasing temperature?
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Question 6 of 25
6. Question
Reverberation of sound is undesirable in a auditorium and is controlled by
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Question 7 of 25
7. Question
Mass number of an element is defined as
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Question 8 of 25
8. Question
Girth of stem increases due to
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Question 9 of 25
9. Question
Rabies virus is spread through
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Question 10 of 25
10. Question
A 10 kW motor works at full rating for 10 Hours working at an efficiency of 90% will consume energy of
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Question 11 of 25
11. Question
Which is the smallest unit of Pressure
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Question 12 of 25
12. Question
Lactometer is the device used for the measurement of
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Question 13 of 25
13. Question
A truck weighting 7 T starting from rest rolls down a hill with a constant acceleration travels a distance of 400 m in 20 sec. The force acting the truck will be
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Question 14 of 25
14. Question
Inheritance of parental features are stored in the form of DNA which stands for
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Question 15 of 25
15. Question
Melting point of ice is
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Question 16 of 25
16. Question
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?
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Question 17 of 25
17. Question
This is not a solid-gas colloidal
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Question 18 of 25
18. Question
A standard to measure the atomic masses is given as
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Question 19 of 25
19. Question
What property of wave changes when it changes its media from air to water?
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Question 20 of 25
20. Question
The sound of the heartbeat of patient using stethoscopes reaches to the ear of the Doctor through
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Question 21 of 25
21. Question
Isotopes of an element is defined as elements having
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Question 22 of 25
22. Question
Cartilage is not found in
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Question 23 of 25
23. Question
Greenhouse effect is caused by the atmospheric excess concentration of
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Question 24 of 25
24. Question
What is responsible for the depletion of ozone layer
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Question 25 of 25
25. Question
Two bricks namely A and B are placed in water at a depth of 2 m and 5 m respectively. Which brick will require more downward force to hold the brick in position?
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