Q1. During winter season, we do not sweat because
(a) We drink less water.
(b) We regulate our body temperature by other mechanisms.
(c) Sweat glands become inactive.
(d) The body temperature is low.
Q2. Sugar takes time to dissolve in cold water because
(a) In cold water, the intermolecular space is less.
(b) In cold water, the intermolecular space is more.
(c) Sugar molecules crystallize in cold water.
(d) The speed of the sugar molecules decreases.
Q3. The liquid used in thermometers is
(a) A non-metal with shiny appearance.
(b) A metal with high boiling point.
(c) A metal with low boiling point.
(d) A non-metal with low boiling point.
Q4. Anything that floats in water
(a) Has low density.
(b) Is lighter than air.
(c) Has high density.
(d) Has low weight.
Q5. Blast furnace followed by collection in fractional distillation column is done for:
(a) Refining petrol
(b) Refining petroleum
(c) Separating petroleum from diesel
(d) Separating unwanted substances from petrol
Q6. During winters, coconut oil is solid at room temperature. This shows that it has:
(a) Saturated fats
(b) Unsaturated fats
(c) Both saturated and unsaturated fats
(d) Cannot be said
Q7. Which of the following fibers are biodegradable?
Q8. The refining of petroleum is done in a:
(b) Fractional distillation column
(c) Distillation column
(d) Blast furnace
Q9. Acid rain happens when:
(a) Bases react with acids.
(b) Acidic oxides react with water.
(c) Acidic hydroxides react with water.
(d) Acids react with water.
Q10. Diamond and graphite are:
(a) Isotopes of carbon
(b) Allotropes of carbon
(c) Isotopes of hydrogen
(d) Allotropes of hydrogen