NCERT CHEMISTRY MOCK TEST 1

🟥 NCERT CHEMISTRY MOCK TEST 1

🟥 QUESTIONS : 25

🟥 TIME : 15 MINS

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1) Isotopes are those atoms of the same element which have

A) Atomic mass is same but atomic number is different

B) Atomic mass is different but atomic number is same

C) Atomic number and atoms mass both are same

D) None of the above

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2) The atoms, in which the number of protons is same but the number of neutrons is different, are known as

A) Isobars

B) Isomers

C) Isotones

D) Isotopes

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3) What is the mass number of an element, the atom of which contains two protons, two neutrons and two electrons?

A) 2

B) 4

C) 6

D) 8

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4) Regarding the atom of a chemical element, the magnetic quantum number refers to

A) Orientation

B) Shape

C) Size

D) Spin

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5) In an atom, the order of filling up of the orbitals is governed by

A) Aufbau’s principle

B) Heisenberg’s uncertainty principle

C) Hund’s rule

D) Pauli’s exclusion principle

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6) Which of the following carries a negative charge?

A) X-rays

B) Alpha particles

C) Beta particles

D) Gamma rays

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7) The Nucleus of Helium has

A) Only one neutron

B) Two protons

C) Two protons and two neutrons

D) One proton and two neutrons

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8) The alpha particle carries two positive charges. Its mass is very nearly equal to that of

A) Two protons

B) An atom of helium

C) Sum of masses of two positrons and two neutrons

D) Two positrons are each positron carries a single positive charge

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9) Which one of the following pairs constitutes particle-antiparticle pair?

A) Electron-Positron

B) Proton-Neutron

C) Photon-Electron

D) Neutron-Neutrino

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10) Which of the following is not a subatomic particle?

A) Neutron

B) Proton

C) Deuteron

D) Electron

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11) In atom, neutron was discovered by

A) J.J. Thomson

B) Chadwick

C) Rutherford

D) Newton

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12) The atomic nucleus was discovered by

A) Rutherford

B) Dalton

C) Einstein

D) Thomson

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13) Which of the following statement about molecular structure is correct?

A) Neutron and electron are found inside the nucleus and protons revolves around the nucleus

B) Electron and proton are inside the nucleus and neutron revolve around the nucleus

C) Proton and neutron are inside the nucleus and electrons revolve around the nucleus

D) Proton, neutron and electron all are inside the nucleus

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14) single type of atom is found in

A) Compounds of minerals

B) Mixture of minerals

C) Native elements

D) None of the above

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15) Which of the following is not a part of an atom?

A) Electron

B) Proton

C) Neutron

D) Photon

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16) With reference to 'fly ash' produced by the power plants using coal as fuel, which of the following statements is/are correct?

1. Fly ash can be used in the production of bricks for building construction.

2. Fly ash can be used as a replacement for some of the Portland cement concrete.

3. Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements.

Select the correct answer using the code given below.

A) 1 and 2

B) 2 only

C) 1 and 3

D) 3 only

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17) Which of the following is/are the example/ examples of chemical change?

1. Crystallization of sodium chloride?

2. Melting of ice

3. Souring of milk

Select the correct answer using the code given below.

A) 1 and 2 only

B) 3 only

C) 1, 2 and 3

D) None

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18) Acid rain is caused by the pollution of environment by

A) carbon dioxide and nitrogen

B) carbon monoxide and carbon dioxide

C) ozone and carbon dioxide

D) nitrous oxide and sulphur dioxide

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19) What is the role of ultraviolet (UV) radiation in the water purification systems?

1. It inactivates /kills the harmful microorganisms in water.

2. It removes all the undesirable odours from the water.

3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.

Which of the statements given above is/are correct?

A) 1 only

B) 2 and 3 only

C) 1 and 3 only

D) 1, 2 and 3

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20) Aspartame is an artificial sweetener sold in the market. It consist of amino acids and provides calories like other amino acids. Yet, it is used as a low-calorie sweetening agent in food items. What is the basis of this use ?

A) Aspartame is as sweet as table sugar, but unlike table sugar, it is not readily oxidized in human body due to lack of requisite enzymes

B) When aspartame is used in food processing, the sweet taste remains, but it becomes resistant to oxidation

C) Aspartame is as sweet as sugar, but after ingestion into the body, it is converted into metabolites that yield no calories

D) Aspartame is several times sweeter than table sugar, hence food items made with small quantities of aspartame yield fewer calories on oxidation

21 / 25

21) Regarding “carbon credits’’, which one of the following statements is not correct ?

A) The carbon credit system was ratified in conjunction with the Kyoto Protocol.

B) Carbon credits are awarded to countries or groups that have reduced greenhouse gases below their emission quota

C) The goal of the carbon credit system is to limit the increase of carbon dioxide emission

D) Carbon credits are traded at a price fixed from time to time by the United Nations Environment Programme

22 / 25

22) Consider the following :

1. Carbon dioxide

2. Oxides of nitrogen

3. Oxides of sulphur

Which of the above is/are the emission/emissions from coal combustion at thermal power plants ?

A) 1 only

B) 2 and 3 only

C) 1 and 3 only

D) 1, 2 and 3

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23) Excessive release of the pollutant carbon monoxide (CO) into the air may produce a condition in which oxygen supply in the human body decreases. What causes this condition?

A) When inhaled into the human body CO is converted into CO2

B) The inhaled CO has much higher affinity for haemoglobin as compared to oxygen

C) The inhaled CO destroys the chemical structure of haemoglobin

D) The inhaled CO adversely affects the respiratory centre in the brain

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24) Consider the following:

1. Oxides of Hydrogen

2. Oxides of Nitrogen

3. Oxides of Sulphur

Which of the above causes/cause acid rain?

A) 1 and 2 only

B) 3 only

C) 2 and 3 only

D) 1, 2 and 3

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25) Which of the following substances are found in the beach sands of many parts of Kerala?

1. Ilmenite

2. Zirecon

3. Sillimanite

4. Tungsten

Select the correct answer using the codes given below:

A) 1, 2, 3 and 4

B) 1, 2 and 3 only

C) 3 and 4 only

D) 1 and 2 only

Your score is

0%

NCERT CHEMISTRY MOCK TEST 1

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