Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-1>Q 32

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An electric kettle takes $4 A$ current at $220 V$ . How much time will it take to boil $1 kg$ of water from temperature $20 ° C ?$ The temperature of boiling water is $100 ° C$ .

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Important Questions on Thermal Properties of Matter

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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-1>Q 33

Time taken by a

836 W

heater to heat one litre of water from

10 ° C

to

40 ° C

is

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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-1>Q 34

2 liters

water at

27 ° C

is heated by a

1 kW

heater in an open container. On average heat is lost to surroundings at the rate

160 J s^{- 1}

. The time required for the temperature to reach

77 ° C

is (The specific heat of water

4.2 J g^{- 1} ° C^{- 1}

)

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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-1>Q 35

A piece of ice (heat capacity

= 2100 J {kg}^{- 1} {{}^{\circ}C}^{- 1}

and latent heat

= 3.36 \times 10^{5} J {kg}^{- 1}

) of mass

m

grams is at

- 5 ° C

at atmospheric pressure. It is given

420 J

of heat so that the ice starts melting. Finally when the ice-water mixture is in equilibrium, it is found that

1 gm

of ice has melted. Assuming there is no other heat exchange in the process, the value of

m

is :

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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-1>Q 36

Two large holes are cut in a metal sheet. If this is heated, distances $A B$ and $B C,$ (as shown)

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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-1>Q 37

A steel scale is to be prepared such that the millimeter intervals are to be accurate within

6 \times 10^{- 5} mm

. Find the maximum variation of temperature from the temperature of calibration during the reading of the millimeter marks is

(α = 12 \times 10^{- 6} K^{- 1})

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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-1>Q 38

Expansion during heating -

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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-1>Q 39

If a bimetallic strip is heated, it will

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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-1>Q 40

Two holes of unequal diameters

d_{1}

and

d_{2} (d_{1} > d_{2})

are cut in a metal sheet. If the sheet is heated-