Grand Test Science

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Q 1. A mixture of sulphur and carbon disulphide is

• heterogeneous and shows Tyndall effect
• homogeneous and shows Tyndall effect
• heterogeneous and does not show Tyndall effect
• homogeneous and does not show Tyndall effect

Q 2. Sol and gel are examples of

• Solid-solid colloids
• Sol is a solid-liquid colloid and gel is liquid solid colloid
• Sol is solid-solid colloid and gel is solid-liquid colloid
• Sol is a liquid-solid colloid and gel is a solid-liquid colloid

Q 3. The atomic mass of calcium (Ca) is 40 g. The number of moles in 60 g of calcium are

• 0.5 mol
• 2.0 mol
• 1.5mol
• 0.75 mol

Q 4.

• 11gm
• 22gm
• 4.4gm
• 44gm

Q 5. Which of the following represents a polyatomic ion

• Sulphide
• Chloride
• Nitride
• Sulphate

Q 6.

• 1
• 2
• 3
• 0

Q 7.

• Law of Constant Proportion
• Law of conservation of mass
• Law of chemical combination
• Law of multiple proportions

Q 8. Which of the following are physical changes? (i) Melting of iron metal (ii) Rusting of iron (iii) Bending of an iron rod (iv) Drawing a wire of iron metal

• (i), (ii) and (iii)
• (i), (ii) and (iv)
• (i), (iii) and (iv)
• (ii), (iii) and (iv)

Q 9 Which of the following methods would you use to separate cream from milk?

• Fractional distillation
• Distillation
• Centrifugation
• Filtration