SCIENCE GK

Class-8

Q1) Blades of a windmill possess ____, hence they are turned by a fast wind.
Ans -: Potential Energy

Q2) A dark-skinned man experiences __, as compared to a fair-skinned man.
Ans -: Less heat & Less cold

Q3) Which device is used to break/complete an electronic circuit?
Ans -: Switch

Q4) What is the temperature at which both the Fahrenheit and the centigrade scales have the same value?
Ans -: -40°

Q5) Acceleration acts always in the direction of the __.
Ans -: Net force

Q6) What is used in the nuclear reactor as a moderator. It is also known as Heavy Water?
Ans -: Deuterium Oxide 

 Q7) Which Metal is in a liquid state at room temperature?
Ans -: Gallium

Q8) ___ elements are non-metal.
Ans -: Electro-negative

Q9) What is known as Artificial Silk.
Ans -: Rayon

Q10) Nitrous Oxide  is also known as –
Ans -: Laughing Gas

Q11. Alcoholic drink contains ___.
Ans -: Ethyl Alcohol

Q12. Glucose is stored in the form of __ by Animals.
Ans -: Glycogen

Q13. Ascariasis is caused by ____.
Ans -: Round Worm

Q14. BCG vaccination (Bacillus Calmette Guerin) gives immunity from ____.
Ans -: Tuberculosis

Q15) Blood groups were discovered by –
Ans -: Karl Landsteiner

Q16)Which metal is used in pencils?
Ans. Graphite
Q.17)Which  metal  forms an amalgam with other metals?
Ans- Mercury.

Que.18)Chlorophyll is a naturally occurring chelate compound in which central metal?
Ans.magnesium

Q.19)Which  non metal that remains liquid at room temperature?
Ans-Bromine

Q.20)Brass gets discoloured in air because of the presence of which ?
Ans- Hydrogen Sulphide

Class-9

Q.1. Who is honored as Father of Modern Chemistry?

Ans-Antoine Lavoisier

Q.2. Who invented periodic table?

Ans-Dmitri Mendeleev

Q.3. Which is the most abundant gas in the earth's atmosphere?

Ans-Nitrogen (78.08%)

Q.4. Which gas evolved from paddy fields and marshes?

Ans-Methane

Q.5. Which toxic element present in automobile exhausts?

Ans-Lead

Q.6. Which gases cause acid rain?

Ans-Sulphur dioxide, Nitrogen oxides

Q.7. Which metal is used in the making of microchips?

Ans-Silicon

Q.8. What is the toxicity caused by silicon called?

Ans-Silicosis

Q.9. Which polymer is used to manufacture electric switches, computer disks etc.?

Ans-Bakelite

Q.10. With which polymer, the cabinets of radio and TV made of?

Ans-Polystyrene

Q.11. Which chemical is used to make rain coats?

Ans-Poly Vinyl Chloride (PVC)

Q.12. Which type of plastics can be recycled?

Ans-Thermoplastics

Q.13. What is the name given to plastics that cannot be recycled?

Ans-Thermosetting plastics

Q.14. Which element is a liquid at ordinary temperature?

Ans-Mercury

Q.15. What is the chemical name of baking soda?

Ans-Sodium bicarbonate

Q.16. What is sodium carbonate commonly known as?

Ans-Washing soda or soda ash

Q.17. What is sodium chloride?

Ans-Table salt

Q.18 What is table sugar?

Ans-Cane sugar (Sucrose)

Q.19. What is the element present on lead pencils?

Ans-Carbon (graphite)

Q.20. Which gas is found in soda water?

Ans-Carbon dioxide

Class- 7

Que.1 Chemical formula for water is-
Ans- H2O.

Que.2 The gas usually used in electric bulb is-
Ans- Nitrogen. 

Que.3 Washing soda is the Common name for-
Ans- Sodium Carbonate

Que.4 Bromine is a-
Ans- Red liquid.

Que.5 The hardest substance available on earth is- 
Ans - Diamond

Que.6 Tetraethyl lead is used as-
Ans- Mosquito Repellent.

Que.7 What is used as lubricant-
Ans - Graphite

Que.8 The Average Salinity of Seawater is- 
Ans- 3.5%  

Que.9 Galvanised iron sheets have a coating of-
And- Zinc

Que.10 Heavy water is-
Ans- Deuterium Oxide 

Que.11 The element Common to all acids is-
Ans- Hydrogen

Que.12 Non stick Cooking utensils are Coated with- 
Ans- Teflon.

Que.13 Monazite is an are of- 
Ans- Thorium. 

Que 14 Carbon, diamond and graphite together called-
Ans- allotropes

Que.15 Potassium nitrate is used in -
Ans- Fertilizer

Que.16 Soda water Contains-
Ans- Carbon dioxide

Que.17 Most soluble in water is-  
Ans- Sugar

Que.18  Sodium metal is kept under -
Ans- kerosene.

Que.19 The filament of electric bulb is made of- 
Ans- Tungsten.

Que.20 Diamond is an allotropic form of-  

Ans- Carbon.

Class-5

Question 1: A male cow is called-

Answer: Ox

Question 2: All animals need food, air and ___ to survive.

Answer: Water

Question 3: Which is Earth’s only natural satellite?

Answer: Moon

Question 4: The tree has a branch filled with green ____.

Answer: Leaves

Question 5: Which part of the body helps you to move?

Answer: Bones and Muscles

Question 6: The two holes of the nose are called?

Answer: Nostrils

Question 7: Which star shines in the day and provides light?

Answer: Sun

Question 8: Legs have feet and arms have ___.

Answer: Hands

Question 9: Which organ covers the entire body and protects it?

Answer: Skin

Question 10: Which part of the bird lets it fly high in the sky?

Answer: Wings

Question 11: Which part of the plant conducts photosynthesis?

Answer: Leaf

Question 12: What is the boiling point of water?

Answer: 100° C

Question 13: ____ helps pump blood through the entire body?

Answer: Heart

Question 14: When you push something, you apply __.

Answer: Force

Question 15: Which group of animals have scales?

Answer: Reptiles

Question 16: Which pigment gives the leaves its green colour?

Answer: Chlorophyll

Question 17: Which tissue connects muscles to bones?

Answer: Tendon

Question 18: Which system of the body controls the senses?

Answer: Nervous system

Question 19: Which is the strongest sense in a dog?

Answer: Smell

Question 20: The standard unit of measurement for energy is _____.

Answer: Joule