Advertisements
Advertisements
Draw a graph to show the variation in density of water with temperature in the range from 0°C to 10°C.
Concept: undefined >> undefined
Describe an experiment to show that water has maximum density at 4°C. What important consequences follow this peculiar property of water? Discuss the importance of this phenomenon in nature.
Concept: undefined >> undefined
Advertisements
Explain the following
Fishes survive in ponds even when the atmospheric temperature is well below 0°C.
Concept: undefined >> undefined
Explain the following
A hollow glass sphere which floats with its entire volume submerged in water at 4°C, sinks when water is heated above 4°C.
Concept: undefined >> undefined
Explain the following
A glass bottle completely filled with water and tightly closed at room temperature is likely to burst when kept in the freezer of a refrigerator.
Concept: undefined >> undefined
Water is cooled from 4 °C to 0 °C. It will :
Concept: undefined >> undefined
Density of water is maximum at :
Concept: undefined >> undefined
Distinguish between D.C. and A.C.
Concept: undefined >> undefined
What do you understand by the term current? State and define its S.I. unit.
Concept: undefined >> undefined
Figure. below shows two conductors A and B. Their charges and potentials are given in diagram. State the direction of (i) flow of electrons and (ii) flow of current, when both the conductors are joined by a metal wire.
Concept: undefined >> undefined
What is a neutral point? How is the position of neutral point located with the use of a compass needle?
Concept: undefined >> undefined
State the positions of neutral points when a magnet is placed with its axis in the magnetic meridian and with its north pole (i) pointing towards the geographic north and (ii) pointing towards the geographic south.
Concept: undefined >> undefined
Complete the following sentence :
At a neutral point, the resultant magnetic field is ___________.
Concept: undefined >> undefined
Complete the following sentence :
The neutral points of a bar magnet kept with its north pole pointing towards geographic north are located ____________.
Concept: undefined >> undefined
What do you understand by the anomalous expansion of water?
Concept: undefined >> undefined
Draw a graph between volume and temperature, when 5 cm3 of ice at -10°C is heated to form water at +10°C.
Concept: undefined >> undefined
How do fishes survive in frozen lakes?
Concept: undefined >> undefined
Explain, why are soft drink bottles not completely filled?
Concept: undefined >> undefined
Explain, why does a glass bottle completely filled with water and tightly capped burst when placed in a freezer?
Concept: undefined >> undefined
Explain, why are the exposed water pipes lagged with straw during severe winter?
Concept: undefined >> undefined
