1. CONCISE Physics - Middle School - 7
1. Physical Quantities and Measurement
4. Light energy
7. Electricity and Magnetism
1. Objective Questions
2. Short/Long Answer Questions
Q1) What is heat? State its S.I. unit.
Q2) What is meant by the term temperature.
Q3) State the three units of temperature.
Q4) Name the instrument used to measure the temperature of a body.
Q5) Name two scales of temperature. How are they interrelated?
Q6) How is the size of a degree on a celsius scale ?
Q7) How is the size of a degree defined on a Fahrenheit scale?
Q9) Write down the temperature of (i) lower fixed point, and (ii) upper fixed point, on the fahrenheit scale.
Q8) State the temperature of
(i) ice point and
(ii) steam point,
on the celsius scale
Q10) What is the Celsius scale of temperature ?
Q11) What is the Fahrenheit scale of temperature ?
Q12) What is the kelvin scale of temperature?
Q13) The fig. Shows a glass tumbler containing hot milk which is placed in a tub of cold water. State the direction in which heat will flow.
Q14) Draw a neat diagram of a laboratory thermometer.
Q15) Write down the body temperature of a healthy person.
Q16) What do you understand by thermal expansion of a substance?
Q17) Name two substances which expand on heating.
Q18) Why do telephone wires sag in summer ?
Q20) Why are gaps left between successive rails on a railway track ?
Q21) A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle. Explain why?
Q22) Why is a cement floor laid in small pieces with a gap in between ?
Q23) One end of a steel girder in a bridge is not fixed, but is kept on rollers. Give the reason
Q24) Describe one experiment to show that liquids expand on heating.
Q25) State one application of thermal expansion of liquids.
Q26) Describe an experiment to show that air expands on heating.
Q27) An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.
Q28) State which expands more, when heated to the same temperature: solid, liquid or gas?
Q29) Name the three modes of transfer of heat.
Q30) Name the mode of transfer of heat in the following:
Q31) What are the good and bad conductors of heat? Give two examples of each.
Q32) Name a liquid which is a good conductor of heat.
Q33) Name a solid which is a good conductor of heat.
Q34) Select good and bad conductors of heat from the following:
Q35) Why is an oven made of double walls with the space in between filled with cork?
Q36) Why do we use cooking utensils made up of copper?
Q37) Why is a tea kettle provided with an ebonite handle ?
Q38) In summer, ice is kept wrapped in a gunny bag. Explain the reason.
Q39) Explain why
(a) we wear woolen clothes in winter.
(b) the water pipes are covered with cotton during very cold water.
Q40) Why are quilts filled with fluffy cotton ?
Q41) State the direction of heat transfer by way of convection.
Q42) Why is a ventilator in a room ?
Q43) Why are chimneys provided over furnace in factories?
Q44) What are the land and sea breezes? Explain their formation.
Q45) Why is the freezing chest in a refrigerator fitted near its top ?
Q46) Explain briefly the process of heat transfer by radiation.
Q47) Give one example of heat transfer by radiation.
Q48) Why do we prefer to wear white or light coloured clothes in summer and black or dark coloured clothes in winter?
Q49) The bottom of the cooking utensils are painted black. Give the reason.
Q50) Draw a labelled diagram of a thermo flask. Explain how the transfer of heat by conduction, convection and radiation is reduced to a minimum in it.
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CONCISE Physics - Middle School - 7
Physical Quantities and Measurement
Electricity and Magnetism
Short/Long Answer Questions
Race To Space
Terms & Policies