1 marks question (Q.1 – Q.26)
1.
a.
b.
2.
a.
b.
c.
d.
3.
a.
b.
4.
a.
b.
c.
d.
5.
a.
b.
6.
a.
b.
7.
a.
b.
8.
a.
b.
9.
a.
b.
c.
d.
10.
a.
b.
In an adiabatic expansion of a gas :
Its pressure increase
c.
Its density increase
Its temperature falls
d.
Its thermal energy increase
Real gas behaves like an ideal gas at :
Low pressure and low temperature
Low pressure and high temperature
High pressure and high temperature
High pressure and low temperature
For a gas at a temperature T the root-mean-square velocity V rms, the most probable speed
Vmp, and the average speed Vav obey the relation :
Vav > Vrms > Vmp
c.
Vmp > Vav > Vrms
Vrms > Vav > Vmp
d.
Vmp > Vrms > Vav
A liquid boils when its vapour pressure equals :
The atmospheric pressure
Pressure of 76.0cm column of mercury
The critical pressure
The dew point of the surroundings
The dimensions of heat is :
[ML2T-1]
c.
[ML-2T-2]
[ML2T-2]
d.
[ML-1T-2]
The dimension of gravitational constant G is :
[ML2T-1]
c.
[M-1L3T-2]
-2
[MLT ]
d.
[M-1LT-2]
The unit of energy is :
Kilowatt
c.
watt-day
joule/s
d.
g-cm/s
Dyne-second stands for the unit of:
angular momentum
c.
work
force
d.
momentum
An atmosphere:
is a unit of pressure
is a unit of force
gives an idea of the composition of air
is the height above which there is no atmosphere
Which of the following is not a unit of time?
Solar year
c.
Light year
Leap year
d.
Tropical year
11.
a.
b.
12.
a.
b.
13.
a.
b.
14.
a.
b.
15.
a.
b.
16.
a.
b.
17.
a.
b.
18.
a.
b.
c.
d.
19.
a.
b.
c.
d.
20.
a.
b.
c.
d.
Which of the following is not a unit of length :
Micron
c.
Angstrom
Light year
d.
Radian
A cube has numerically equal volume and surface area. The volume of such a cube is :
216 unit
c.
2000 unit
1000 unit
d.
3000 unit
Proper symbol for kilowatt-hour is :
kwh
c.
kWH
KWH
d.
kWh
unit of universal gas constant in S.I system :
wattK-1mol-1
c.
jouleK-1mol-1
joule/newtonK-1mol-1
d.
ergK-1mol-1
The dimensions of coefficient of thermal expansion
[T-1]
d.
[K-1]
[M-1]
c.
[L-1]
Light from the sun reaches earth approximately in :
5s
c.
500s
50s
d.
0.5s
On the Celsius scale the absolute zero of the temperature is at :
0’C
c.
100’C
-32’C
d.
-273’C
The Fahrenheit and Reaumur scales of temperature will the same value reading at :
-25.6
-40
546.75
213.6
When a strip made of iron and copper is heated :
Its length does not change
It get twisted
It bend with iron on concave side
it bend with iron on convex side
triple point of any material is :
the state at which solid , liquid, and gas phase of the material can co-exist in equilibrium
the state at which the three coordinate off the material P , V and T remains constant
the state at which the three coordinate of the material P, V and T are Zero
a combination of three state with different values of coordinate P, V and T
21.
a.
b.
22.
a.
b.
c.
d.
a process in which volume of the system remains constant is called :
Isobaric process
c.
Isochoric process
Isothermal process
d.
Adiabatic process
Work done during an adiabatic expansion of a perfect gas is given by :
W = RT/(1 - γ )
W = RT/(γ - 1)
W = R(Tf – Ti)/( 1 - γ)
W = R(Tf-Ti )/( γ - 1)
23.
a.
b.
24.
a.
b.
25.
Dimension of potential energy is :
[MLT-1]
c.
[ML2T-2]
[ML2T2]
d.
[ML-1T-1]
A piece of ice floating in a jar containing water. When the ice melts then the level of water :
Raises
c.
Remains unchanged
Falls
d.
Raises or falls
800cc volume of a gas having γ =5/3 is suddenly compressed adiabatically to 100cc. If the
initial pressure is P then final pressure will be :
P/32
c.
8P
24P/5
d.
32P
A gas at 27’C has a volume V and pressure P is doubled and volume becomes tree times. The
resulting temperature of the gas will be :
1800’C
c.
1527’C
162’C
d.
600’C
a.
b.
26.
a.
b.
2 marks question ( Q.27 – Q.48)
27.
a.
b.
28.
a.
b.
29.
a.
b.
30.
a.
b.
c.
d.
At constant temperature on increasing the pressure of a gas by 5% will decrease its volume by
5%
c.
4.26%
5.26%
d.
4.76%
The temperature at which root mean square velocity of molecule of helium is equal to root
mean square velocity of hydrogen at NTP is
273’C
c.
546’C
273K
d.
844K
The average kinetic energy of a hydrogen gas molecule at NTP will be (k = 1.38x10 -23 J) :
0.186X10-20 J
c.
0.56X10-20 J
-20
0.372X10 J
d.
5.6X10-20 J
A balloon contains 500m3 of helium at 27’C and 1 atm pressure. The volume of helium at -3’C
temperature and 0.5 atm pressure will be :
500m3
700m3
900m3
1000m3
31. The average kinetic energy of the gas molecule at 27’C is6.21x10-21 J. its average kinetic energy
at 227’C will be :
a. 52.2x10-21 J
b. 5.22X10-21 J
c. 10.35X10-21 J
d. 11.35X10-21 J
32. The force is proportional to square of velocity, then dimension of proportionality constant is :
a. [ML-1T]
c.
[MLTO]
b. [ML-1T0]
d.
[M0LT-1]
P(Pa)
33. An ideal gas expands along the path AB as shown in P-V diagram. The work done is: 8
a. 4x104 J
b. 1.2X105 J
4
5
c. 2.4X10 J
d. None of these
0.3 0.5 V(m3)
34. Unit of surface tension is :
a. Nm-1
b. Nm-2
c. N2m-1
d. Nm-3
35. Work done in the given cyclic process is :
2P1
a. P1V1
b. 3P1V1
c. 2P1V1
P1
d. Zero
36. The dimension of K in the equation W = 1/2Kx2
V1
V2
a. [M1L0T-2]
c.
[M1L1T-1]
b. [M0L1T-1]
d.
[M1L0T-1]
37. Position of a body with acceleration a is given by x=Kamtn . Here t is time. the value of m and
n is :
a. 1,1
c.
2,1
b. 1,2
d.
2,2
38. A system has basic dimension of density [D], velocity[V] and area[A]. the dimensional
representation of force in this system is ;
a. [AV2D]
c.
[AVD2]
b. [A2VD]
d.
[A0VD]
39. Velocity of a particle depends upon t as V = A + Bt + Ct2. If velocity is in m/s then unit of A will
be
a. m/s
c.
m-s
2
b. m/s
d.
m2/s
40.
a.
b.
41.
a.
b.
42.
a.
b.
43.
a.
b.
44.
a.
b.
45.
a.
b.
46.
a.
b.
47.
a.
b.
48.
a.
b.
If the unit of length, mass, and time be each doubled, then how the unit of work will change;
Doubled
c.
remains same
three times
d.
none of these
If the density of wood in C.G.S. system is 0.5gm/cc, then what will be the value in S.I system:
50kg/m35
c.
000kg/m3
3
500kg/m 2
d.
50kg/m3
The density of a gas at S.T.P. is 1.5gm/liter, then calculate the R.M.S. velocity of the gas :
432.50x102 cm/sec
c.
540.43x102 cm/sec
450.32x102 cm/sec
d.
545x102 cm/sec
The R.M.S velocity of argon at S.T.P. ,if the molecular weight of argon is 36 and R = 8.31
J/kgmol’C. :
492.7m/s
c.
328.2m/s
432m/s
d.
458.35m/s
The ratio of R.M.S. velocity of oxygen and Hydrogen at S.T.P.( Molecular wt. Of oxygen and
Hydrogen are respectively 32 and 2)
4:1
c.
16:1
1:4
d.
1:16
The velocity of sound in a gas at N.T.P. , if the R.M.S. velocity of gas molecule at 0’C is 500m/s
332m/s
c.
353m/s
340m/s
d.
240m/s
A scooter tyre is pumped to a pressure of 8 atm at 27’C. the temperature of the air when the
type suddenly bursts (γ = 1.5) :
100K
c.
150K
125K
d.
273K
A faulty centigrade thermometer has its upper fixed point 110’C, where as its L.F.P. is 0’C. if
this thermometer if dipped in a liquid whose actual temperature if 50’C , then what will be the
reading of the faulty thermometer ;
60’C
c.
66’C
50’C
d.
55’C
The Fahrenheit and Kelvin scales of temperature will give the same reading at :
-40
c.
574.25
313
d.
732.75
3 marks question (Q.49 – Q.58)
49. The length of a steel and copper wire at 0’C, if the difference in their length remains 35cm at
all temperatures: (𝛂 for steel is 1.2x10 - 5 , α foe copper is 1.7x10 -5 )
a. 35cm, 70cm
c.
119cm, 84cm
b. 84cm, 119cm
d.
125cm, 90cm
More than one choice is correct ( Q.50 – Q.58)
50.
a.
b.
c.
d.
51.
a.
b.
52.
a.
b.
53.
a.
b.
c.
d.
54.
a.
b.
55.
a.
b.
c.
d.
56.
a.
b.
c.
d.
57.
a.
b.
c.
d.
58.
a.
b.
c.
d.
Which of the following statement is not correct :
Size of degree is smallest on Celsius scale
Size of degree is smallest on Fahrenheit scale
Size of degree is equal on Fahrenheit and Kelvin scale
Size of degree is equal on Celsius and Kelvin scale
Reading of temperature may be same on :
Celsius and Kelvin scale
c.
Celsius and Fahrenheit scale
Fahrenheit and Kelvin scale
d.
All the three scales
To measure a temperature say around 400’C which of the following thermometer can be used
most conveniently
Gas thermometer
c.
Platinum thermometer
Mercury thermometer
d.
Thermocouple
Which of the following statements are true :
Rubber contracts on heating
Water expands on freezing
Water contracts on heating from 0’C to 4’C
Water expands on heating from 4’C to 40’C
If α , β and γ are coefficient of linear , superficial , volume expansion respectively then :
β/α = 1/2
c.
γ/α = 3/1
β/γ = 2/3
d.
β/α = γ/β
Due to thermal expansion with rise in temperature :
Metallic scale reading becomes lesser than true value
Pendulum clock becomes
A floating body sink a little more
The weight of a body in a liquid increases
Which of the following statement are not true :
Heat is a macroscopic physical quantity
Heat is intrinsic property of a body
Heat is stored in a body as internal energy
Heat is path independent
Thermal capacity of a body depends on :
The heat given
The temperature
The mass of the body
The material of the body
Which of the following statement are true :
Whole of work can be converted into heat
Whole of heat can be converted into work
Temperature of a body can be raised without heating
Temperature of a body may not change when it is heated