SAT Physics - Heat

Exam Duration: 45 Mins Total Questions : 30

1 )

When the temperature increases the density of a substance

(a)
decreases
(b)
increases
(c)
first increase then decreases
(d)
first decrease then increases

2 )

Two spheres of the same size are made of the same metaI, but one is hollow and the other is solid. When they are heated to the same temperature

(a)
solid sphere will expand more
(b)
hollow sphere will expand more
(c)
only the solid sphere will expand
(d)
both spheres will expand almost equally

3 )

The rate of evaporation of water when it is placed under partial vacuum without changing the temperature will

(a)
drop to zero
(b)
decrease
(c)
increase
(d)
remain unaffected

4 )

When water is heated from 0⁰C, its volume

(a)
remains the same
(b)
decrease till 4⁰C
(c)
increases
(d)
first increases then decreases

5 )

When 1 g of water at 100°C gets converted into steam, at the same temperature the change in volume

(a)
1cc
(b)
1000 cc
(c)
1500 cc
(d)
1670 cc

6 )

In a car, radiator the fan are used to cool the engine. The modes of heat transfer involved are

(a)
conduction and convection
(b)
conduction and radiation
(c)
radiation and convection
(d)
conduction, convection and radiation

7 )

The variation in temperature with time when some wax cools form the liquid phase to the solid phase. The point in which at liquid as well as solid phase is

(a)
P
(b)
Q
(c)
R
(d)
S

8 )

Steam produces more burning than water at 100⁰C because

(a)
water has high specific heat capacity
(b)
latent heat of steam
(c)
steam has high specific heat capacity
(d)
the temperature of steam is much higher than of water

9 )

The amount of heat required to raise the temperature of 100 g of copper from 20°Cto 70°C [specificheat capacity of c~per 390 J kg-1°C^-1]

(a)
1950J
(b)
3900J
(c)
1650J
(d)
780J

10 )

1300J of heat is supplied to raise the temperature of 0.5 kg of lead from 20°C to 40°C. e specific heat capacity of lead is

(a)
700 J kg^-1°G^-1
(b)
130 J kg^-1°G^-1
(c)
260 J kg^-1°G^-1
(d)
0.130 J kg^-1°G^-1

11 )

When 50 cal of heat are supplied to 25 g of water, the rise in temperature is

(a)
75⁰C
(b)
2⁰C
(c)
125⁰C
(d)
15⁰C

12 )

80 cal of heat is absorbed when

(a)
1 g of ice melts at 100°C
(b)
10 g of ice melts at 100°C
(c)
1 g of ice melts at OOC
(d)
100g of ice melts at 0⁰C

13 )

A temperature difference of 33°C on the kelvin scale is

(a)
316 K
(b)
243 K
(c)
zero
(d)
33K

14 )

At what temperature do the Fahrenheit and celsius scales give the same reading

(a)
0°
(b)
273°
(c)
574°
(d)
-40⁰

15 )

Which of the following metal is used In thermometers?

(a)
Copper
(b)
Mercury
(c)
Aluminium
(d)
Iron

16 )

Which metal is found in liquid state at room temperature?

(a)
Fe
(b)
Zn
(c)
Hg
(d)
Al

17 )

New technologies have been developed to provide thermal energy, without scorching your body. One of these has micro sensors that work like invisible thermostats, that measure the temperature of different parts of your body and generate thermal energy accordingly. This technology is

(a)
Still in the development stage
(b)
Found only in research labs
(c)
An electric blanket
(d)
Thermal underwear

18 )

A technology that has replaced boiling water over an open campfire gives us a warning when the water is boiled. This technology is

(a)
A micro-sensing digital boiler
(b)
A solar powered water heater
(c)
An electric kettle
(d)
A hot water heater

19 )

Absolute zero is a temperature on the Kelvin scale.Although no one has ever been able to cool anything down to absolute zero, scientists know that it is

(a)
137.15 K
(b)
237.15 K
(c)
173.15 K
(d)
273.15 K

20 )

A material, which is affected by changes in some features of the environment, such as temperature is called a

(a)
Circuit
(b)
Sensor
(c)
Signal
(d)
Responder

21 )

Recording thermometers are called thermo-graphs.The 'temperature writer' uses a rotating drum to record changes in temperature. Tiny movements of this device can make large movements on the recording instrument.The device which makes these tiny movements is the:

(a)
Lever
(b)
Pen
(c)
Bimetallic strip
(d)
Rotating drum

22 )

Another important idea about temperature and the particle theory is that the motion of particles increases when the temperature increases. Which of statements below is correct?

(a)
As the motion of particles decreases, the temperature remains the same
(b)
As the temperature decreases, the motion of the particles also increases
(c)
As the motion of the particles decreases, the temperature decreases
(d)
As the temperature increases, the motion of the particles decreases

23 )

Solids made of different metals were all heated to 100°C to determine how their volume and length would be affected. Which statement describes the most likely outcome of this experiment?