01.
It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.
Q2. Calculate the pressure applied on a body of area 50 m' if a force of 100 N acts on it.
Q3. A pendulum oscillates 60 times in 6 seconds. Find its time period and frequency
Q4. List the common varieties of polyester. Also, mention the natural fibres which are used for
blending to enhance their properties.
Q5. Give reasons:
(a) Sodium and potassium are stored in kerosene.
(b) Lemon pickle should not be stored in aluminium utensils.
(c) Copper is preferred to make electrical wires.
Q6. Name the following:
(a) a metal used to make food wrapping foil.
(b) a non-metal which is liquid at room temperature.
(c) a metal used in a thermometer.
Q7. Name the food preservation methods for the following:
(a) Jams and Jellies
(b) Pickles
(c) Meat and fish
Q8. Freshly collected cow's milk spoils within a few hours at room temperature but the m
packed in a tetra pack stays fresh for a longer period of time. Give reason.
Answers
Answer:
01.
It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.
Q2. Calculate the pressure applied on a body of area 50 m' if a force of 100 N acts on it.
Q3. A pendulum oscillates 60 times in 6 seconds. Find its time period and frequency
Q4. List the common varieties of polyester. Also, mention the natural fibres which are used for
blending to enhance their properties.
Q5. Give reasons:
(a) Sodium and potassium are stored in kerosene.
(b) Lemon pickle should not be stored in aluminium utensils.
(c) Copper is preferred to make electrical wires.
Q6. Name the following:
(a) a metal used to make food wrapping foil.
(b) a non-metal which is liquid at room temperature.
(c) a metal used in a thermometer.
Q7. Name the food preservation methods for the following:
(a) Jams and Jellies
(b) Pickles
(c) Meat and fish
Q8. Freshly collected cow's milk spoils within a few hours at room temperature but the m
packed in a tetra pack stays fresh for a longer period of time. Give reason.
Explanation: