General Science Quiz

1. In fireworks, the green flame is produced because of
1. sodium
2. barium
3. mercury
4. potassium

2. Permanent hardness of water can be removed by adding
1. chlorine
2. washing soda
3. potassium permanganate
4. bleaching powder

3. Marsh gas is
1. nitrogen
2. ethane
3. methane
4. hydrogen

4. Which of the following metals remain in liquid for under normal conditions?
1. Radium
2. Zinc
3. Uranium
4. Mercury

5. Potassium Permanganate is used for purifying drinking water, because
1. it is a sterilising agent
2. it dissolves the impurities of water
3. it is a reducing agent
4. it is an oxidising agent

6. Which of the following is an element?
1. Ruby
2. Sapphire
3. Emerald
4. Diamond

7. The ohms law is –
1. R=E/W
2. R=E/I
3. R=E/Z
4. None of these

8. The damage of the human body due to radiation (χ-rays or γ-rays etc,) is measured in –
1. Rads
2. Rems
3. Roentgen
4. Curie

9. Flywheel is an important part of a steam engine because it –
1. gives strength to the engine
2. accelerates the speed of the engine
3. helps the engine in keeping the speed uniform
4. decreases the moment of inertia

10. An electric bulb has a filament made of –
1. Copper
2. Iron
3. Lead
4. Tungsten


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  1. methane
    a gaseous decomposition product of organic matter, consisting primarily of methane. Well, a crowd gathered round and a scientist said it was marsh gas. Also called marsh gas, methane is a colorless, odorless gas.

  2. Roentgen
    Discovery of X-ray Beams. Wilhelm Roentgen was already working on the effects of cathode rays during 1895, before he actually discovered X-rays. His experiments involved the passing of electric current through gases at extremely low pressure.

  3. rad: Rad is the term used to describe absorbed radiation dose. It describes a specific amount of energy absorbed in a medium (human tissue, for example). In the International System of Units, the gray (Gy) describes absorbed radiation dose. One gray is equal to 100 rad.

    rem: Rem is the term used to describe equivalent or effective radiation dose. In the International System of Units, the sievert (Sv) describes equivalent or effective radiation dose. One Sievert is equal to 100 rem. It is a unit that is the product of energy absorbed in human tissues and the quality of the radiation being absorbed (the ability of the radiation to cause damage).

  4. Washing soda is used to remove permanent hardness on addition of sodiumcarbonate (washing soda) in the hard water, it converts soluble calcium and magnesium ion into insoluble calcium and magnesium carbonate respectively.

    Hence the soft water is drained off

    Na2Co3 + CaCl2 —> CaCo3↓ + NaCl

    Na2Co3 + Caso4 —> CaCo3↓ + Na2so4

    Na2Co3 + Mgso4 —> MgCo3↓ + Na2So4

  5. Hmm…apni presence show krna jaroori ne h yr…to b silent is gud for smtyms..success make the noise

  6. Sorry ji I don't have any idea abt online coaching…..u can join coaching if u have tym

  7. Bilkul mujhe nuksan jyada tha….bt benefit b tha….koe ne ab jo decision liya bilkul.sae

  8. Diamonds are made up of the element carbon. Also, graphite is also made up of carbon. The only difference between the two is the way that the atoms are bonded together.

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