Q1. Solder is an alloy of
(a) tin and lead
(b) tin and copper
(c) tin, copper and zinc
(d) tin, lead and zinc
Q2. Soap helps in cleaning clothes, because—
(a) chemical of soap change
(b) it increases the surface tension of the solution
(c) it absorbs the dirt
(d) it lowers the surface tension of the solution
Q3. Mildness of shaving cream is enriched by which one of the following?
(a) Sodium silicate
(b) Free fatty acid
(c) Potassium carbonate
(d) Sodium chloride
Q4. In isotopes the number of neutrons are—
(d) None of these
Q5. Which one is not metal?
(d) All of these
Q6. Scattering of light takes place in—
(c) solution of electrolyte
(d) colloidal solution
Q7. What is iodised table salt?
(a) An element
(b) A compound
(c) A heterogeneous mixture
(d) A homogeneous mixture
Q8. In surgery, metal pins are used for joining together broken bones. These metal pins remain uncorroded in the body. What is the material of these pins?
Q9. Which fertilizer is assimilated directly by the plant?
(a) Super phosphate
(c) Muriate of Potash
Q10. Which gas is commonly used in anesthesia?
(b) nitrous oxide
(d) hydrogen peroxide
Q11. Which one of the following elements is a metalloid?
(d) Both (a) & (b)
Q12. Baby Blue Syndrome is because of:
Q13. Which one of the following acid is formed during the change of milk into curd
(a) Acetic acid
(b) Ascorbic Acid
(c) Citric Acid
(d) Lactic Acid
Q14. The natural dye present in turmeric is known as
(c) Methyl orange
Q15. Which gas is responsible for the swelling of bread?
(b) Carbon monoxide
(d) Carbon dioxide
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