Q. Which of the following is not a characteristic of a physical change?
1) It is a temporary change
2) It is usually an irreversible change
3) Very little heat (or light) energy is usually absorbed or given out
4) The mass of a substance does not alter in a physical change
Q. Sound cannot travel through -
1) Solids
2) Liquids
3) Gases
4) Vaccum
Q. What is the correct ascending order of the following substances in relation to their density (kg/ m3)?
1) Aluminium, Iron, Mercury, Gold
2) Gold, Iron, Aluminium, Mercury
3) Mercury, Iron, Gold, Aluminium
4) Iron, Gold, Mercury, Aluminium
Q. Which of the following metals exists in the liquid state?
1) Sodium
2) Mercury
3) Silver
4) Chromium
Q. Which of the following metals is not strong?
1) Sodium
2) Gold
3) Silver
4) Iron
Q. The device used for producing electric current is called -
1) Generator
2) Galvanometer
3) Ammeter
4) Motor
Q. Sun derives its energy from -
1) The fusion of hydrogen nuclei into helium nuclei
2) The fusion of helium nuclei into hydrogen nuclei
3) The fission of hydrogen nuclei
4) The fission of helium nuclei
Q. Which of the following statements is/ are true?
I. A concave mirror is used as a head-mirror by the ENT surgeons.
II. The concave metal dishes are used in dish antennas (or the dish aerials) of televisions.
1) Only I is correct
2) Only II is correct
3) I and II both are correct
4) Neither I nor II is correct
Q. Which of the following materials cannot be used to make a lens?
1) Water
2) Glass
3) Plastic
4) Clay
Q. Which one of the following is a non-metallic mineral?
1) Iron
2) Mica
3) Copper
4) Bauxite
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