RRB JE Mock Test 2019

1. The advantage of detergents over soaps is –      (3)

1. 1. detergents are soluble in water
2. 2. detergents could not give much lather
3. 3. detergents give lather even with hard water
4. 4. soaps give lather with only soft water

2. The gas used for artificial fruit ripening of green fruit is –      (2)

1. 1. Nepthalene
2. 2. Acetylene
3. 3. Ethane
4. 4. Methane

3. The substance most commonly used as a food preservative is –       (4)

1. 1. Sodium carbonate
2. 2. Tartaric acid
3. 3. Lactic acid
4. 4. Sodium salt of benzoic acid

4. Tetra Ethyl Lead (TEL) is used as-         (4)

1. 1. a catalyst in burning fossil fuel
2. 2. an antioxidant
3. 3. a reluctant
4. 4. an antiknock compound

5. Detergents clean surfaces on the principle of –       (2)

1. 1. Viscosity
2. 2. Surface tension
3. 3. Elasticity
4. 4. Floatation