Multiple Choice Question on Basic Concept of Science Class IX 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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The Answer Key:
Sr No Question Answer Remarks 1 What is the smallest size of the matter known as? Atom The smallest size of any matter is the atom of which it is made of. Neutron and electron are sub part of the atom and combination of atoms makes a molecule. 2 Latent heat of fusion is the amount of heat energy required to change the state of one Kg of solid to liquid state at its melting point When solid is liquefying, it requires energy to remain at that state at melting point before the temperature changes. 3 Which one of the following is a pure matter? Iron Milk is not a pure matter but consists of fat, carbohydrates etc. Similarly Ice is a compound of hydrogen and oxygen. Iron is a pure matter 4 For making carbon monoxide, 3 g of carbon will require how many grams of oxygen? 4 In CO, carbon and oxygen are in the ratio of 12:16; therefore, 3 g will require 4 g of oxygen 5 What is an isotope of an atom? having same atomic number but different mass number when atomic number is same but mass number is different, it is isotopes e.g. Chlorine has 35 and 37 mass number for atomic number of 17. And when atomic number is different but for same mass number it is isobars such as Ca/Ar having mass number of 40 but atomic number of 20 and 18. The number of neutrons is 20 in atoms of Chlorine and Potassium having mass number of 37 and 39 and are called isotones. 6 What will happen if plasma membrane of a cell punctures? the cell will die If the plasma membrane ruptures or breakdown then the cell will not be able to exchange material from its surrounding by diffusion or osmosis. Thereafter the protoplasmic material will be disappeared and the cell will die. 7 What is the function of phloem tissue to carry sugar and other organic nutrients made by the leaves to other parts of the plant 8 Why pulling is easier than pushing? Pulling is easier as the vertical component of force reduces the apparent weight and thus the frictional force 9 Why does one has to wear safety belt while driving a car? one should not hit the dash board if the brake had to be applied suddenly or car hits an obstruction During run your body is in motion and if the car hits an obstruction and had to come to rest suddenly, the body will fall towards the dashboard and person may get injured. Similarly head rest is provided that if your car is hit by another car from rear when in rest, the body will fall backward and spinal chord may get damage. 10 Why a person falling on a soft cushion does not get hurt? the time taken for the body to come to rest is delayed due to the cushioning effect 11 Two objects of 55 Kg and 60 Kg moving at a velocity of 6 and 5 m/sec in opposite direction and gets entangled. The entangled mass will move in which direction and at what speed? Two objects of 55 Kg and 60 Kg moving at a velocity of 6 and 5 m/sec in opposite direction and gets entangled. The entangled mass will move in which direction and at what speed? The two body is having a momentum of 330 and 300 Kgm/s. Let 55 kg mass is moving from west to east. The net momentum is 30 Kgm/s from west to east. The final momentum is 115*V and therefore V=30/115 =0.26 Kgm/from west to east. 12 In order to calculate the total distance travelled by an object, following three parameters shall be known? All The equation of motion is governed by v=u+at, 2as=(v²-u²), s=ut+½at² and s=(v+u)/2t 13 An object is thrown vertically upward and travels a distance of 10 m. What was its initial velocity? An object is thrown vertically upward and travels a distance of 10 m. What was its initial velocity? We know v²-u²=2gh or u=√2gh or u=14 m/s 14 The volume of 50 g substance is 20 cm³. Is possible to float this body in water having density of 1 gm.*cm¯³? No The weight of the object is 50 g and the buoyant force shall be equal or more than 50 g for the object to float. Here the buoyant force is 20 g and therefore it cannot float. 15 A 60 W lamp is replaced by 12 W LED lamp. What will be the percentage saving in electricity per year? 0.8 The energy consumption with 60W lamp is X than it will X/5 for 12 LED lamp. The saving is 80%. 16 What is audible range of frequency for human being? 20-20000 Hz 17 Ascaris worm lives in which part of the human body? Small Intestines 18 Solar radiation heats up water bodies slower than land 19 Which of the following a common feature of monera and Protista autotrophic mode of nutrition 20 How is the nitrogen of the environment is utilized for life on earth? Lightening, high temperature and pressure Lightening , high pressure and temperatures results nitrogen molecule to convert to oxides of nitrogen which mixes with water to give nitric and nitrous acid and goes down to earth and utilized by life forms. -
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Question 1 of 20
1. Question
What is the smallest size of the matter known as?
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Question 2 of 20
2. Question
Latent heat of fusion is the amount of heat energy required to change the state of
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Question 3 of 20
3. Question
Which one of the following is a pure matter?
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Question 4 of 20
4. Question
For making carbon monoxide, 3 g of carbon will require how many grams of oxygen?
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Question 5 of 20
5. Question
What is an isotope of an atom?
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Question 6 of 20
6. Question
What will happen if plasma membrane of a cell punctures?
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Question 7 of 20
7. Question
What is the function of phloem tissue
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Question 8 of 20
8. Question
Why pulling is easier than pushing?
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Question 9 of 20
9. Question
Why does one has to wear safety belt while driving a car?
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Question 10 of 20
10. Question
Why a person falling on a soft cushion does not get hurt?
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Question 11 of 20
11. Question
Two objects of 55 Kg and 60 Kg moving at a velocity of 6 and 5 m/sec in opposite direction and gets entangled. The entangled mass will move in which direction and at what speed?
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Question 12 of 20
12. Question
In order to calculate the total distance travelled by an object, following three parameters shall be known?
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Question 13 of 20
13. Question
An object is thrown vertically upward and travels a distance of 10 m. What was its initial velocity?
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Question 14 of 20
14. Question
The volume of 50 g substance is 20 cm³. Is possible to float this body in water having density of 1 gm.*cm¯³?
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Question 15 of 20
15. Question
A 60 W lamp is replaced by 12 W LED lamp. What will be the percentage saving in electricity per year?
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Question 16 of 20
16. Question
What is audible range of frequency for human being?
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Question 17 of 20
17. Question
Ascaris worm lives in which part of the human body?
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Question 18 of 20
18. Question
Solar radiation heats up
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Question 19 of 20
19. Question
Which of the following a common feature of monera and Protista
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Question 20 of 20
20. Question
How is the nitrogen of the environment is utilized for life on earth?
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