Question

Q. 4. Identify the correctly matched pair in the following:
(a) Sundarban Rhino
(b) Ranthambore - Lion
(c) Gir - Lion
(d) Kaziranga - Sea Turtle
Q. 5. The male gamete is :
(a) Ova
(b) Uterns
(c) Sperm
(d) Oviduct
Q. 6. The pitch of sound depends on:
(a) Frequency
(b) Amplitude
(c) Both of these
(d) None of these
Q. 7. Which of the following metal is most reactive ?
(a) Gold
(b) Sodium
(c) Magnesium
(d) Silver
Q. 8. Friction is a :
(a) Contact force
(b) Non-contact force
(c) Magnetic Force
(d) None of these
Q. 9. Light enters the eye through:
(a) Pupil
(b) Comea
(c) Eye lens
(d) Retina
Q. 10. LPG is :
(a) Liquid Fuel
(b) Gas Fuel
(c) Solid Fuel
(d) None of these
Q. 11. What is the main chemical component present in strikeing surface of a match
box ?
(a) Potassium chlorate
(b) Phosphorus
(c) Potassium
(d) Graphite
Note: Question numbers 12 to 21 are 2 marks.
* Answer any seven questions from question number 12 to 21.
Q. 12. Name two methods of irrigation which conserve water.
Q. 13. Differentiate between thermoplastic and thermosetting plastics.​

Answer 1

Answer:

• Gir - Lion
• Sperm
• Frequency
• Sodium
• Contact force
• Pupil
• Liquid Fuel
• Phosphorus
• Two means of irrigation systems which conserve water are Drip system and sprinkler system.
• Thermosetting is a material that strengthens when heated, but cannot be remolded or heated after the initial forming,whilethermoplastics can be reheated, remolded, and cooled as necessary without causing any chemical changes.