500 General Science For Assam Agriculture, PNRD, Assam Police, Assam TET, SSC & Railway Exam (Part-7)

General Science

For Assam Agriculture, PNRD, Assam Police, Assam TET, Forest, DECT, APSC, Railway & SSC Exam (Part-7)

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500 General Science (Part-7)

1➤ (Q) What is Electromagnetic radiation with maximum wavelength?

Ans:- Radio waves

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2➤ (Q) Which nuclear particles responsible for holding all nucleons together?

Ans:- Mesons

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3➤ (Q) In which process, a nucleus spontaneously breaks down by emitting radiation?

Ans:- Radioactive decay

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4➤ (Q) In atomic reactors, graphite is used as which name?

Ans:- Moderator

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5➤ (Q) Why is Cobalt-60 commonly used in radiation therapy?

Ans:-Because it emits gamma rays

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6➤ (Q) A radioactive substance has a half life of four months. Three-fourth of the substance would decay in how many months?

Ans:- 8 months

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7➤ (Q) What is a bond formed by the transfer of electrons between atoms of the elements called?

Ans:- ionic bond

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8➤ (Q) What is a bond formed by sharing of electrons between atoms of the elements called?

Ans:- covalent bond

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9➤ (Q) What is the maximum number of hydrogen bonds in a H2O molecule?

Ans:- 4

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10➤ (Q) Select the compound in which chlorine shows oxidation state + 7?

Ans:- HClO4

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11➤ (Q) What is the oxidation of two Cl atoms in bleaching powder Ca(OCl) Cl?

Ans:- +1, -1

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12➤ (Q) What is the Oxidation state of Mn in acidic KMnO4 change from?

Ans:- +7 to +2

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13➤ (Q) Why is Molten NaCl good conductor of electricity?

Ans:- Free ions

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14➤ (Q) What is the common oxidation state of alkali metals in the combined state?

Ans:- +1

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15➤ (Q) What is the oxidation number and co-valency of sulphur in S8?

Ans:- 0, 2

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16➤ (Q) Starch iodide paper is used to test for the presence of which agent?

Ans:- Oxidising agent

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17➤ (Q) The pH of water at 25° C is 7. When it is heated to 100°C, what will the pH of water?

Ans:- increases

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18➤ (Q) When Metal carbonate reacts with dilute acids, what does it forms?

Ans:- CO2

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19➤ (Q) The element common to all the acids is known as which name?

Ans:- Hydrogen

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20➤ (Q) What is the sum of pH and pOH in aqueous solution at 25°C?

Ans:- 14

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