Physics Test 109

Result

Physics Test 109

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

A closed gas cylinder is divided into two parts by a piston held tight. The pressure and volume of gas in two parts respectively are (P, 5V) and (10P, V). If now the piston is left free and the system undergoes isothermal process, then the volume of the gas in two parts respectively are:-

A
2V, 4V

B
3V, 3V

C
5V, V

D
4V, 2V

Solution
Question 2
4 / -1

Two spherical vessel of equal volume, are connected by a narrow tube. The apparatus contains an ideal gas at one atmosphere and 300K. Now if one vessel is immersed in a bath of constant temperature 600K and the other in a bath of constant temperature 300K. Then the common pressure will be :-

A
1 atm

B
4/5 atm

C
4/3 atm

D
3/4 atm

Solution
Question 3
4 / -1

A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by 62°C, the Efficiency of the engine is doubled. The temperatures of the source and sink are :-

A
80°C, 37°C

B
95°C, 28°C

C
90°C, 37°C

D
99°C, 37°C

Solution
Question 4
4 / -1

A thermodynamic process is shown in the figure. The pressures and volumes corresponding to some points in the figure are:

P_A = 3 × 10⁴ Pa, P_B = 8 × 10⁴ Pa and

V_A = 2 × 10^–3 m³, V_D = 5 × 10^–3 m³.

In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be:-

A
560 J

B
800 J

C
600 J

D
640 J

Solution
Question 5
4 / -1

An uniform bar of mass m and length L lies on a horizontal floor as shown in the figure. Region X > 0 has coefficient of friction m while Region X < 0 is smooth. A constant external horizontal force F = μmg starts pulling the bar as shown in the figure. Speed of block when its rear end crosses origin is :-

A

B

C
zero

D

Solution
Question 6
4 / -1

Figure shows the path followed by a particle. Its velocity is shown at points A and B. which of the vectors in the given options best represents the average acceleration of the particle for its motion from A to B ?

A
(1)

B
(2)

C
(3)

D
(4)

Solution
Question 7
4 / -1

In the given figure if all the surfaces are smooth then the acceleration of the two boxes relative to the trolley is

A
3a₀/2

B
a₀

C
a₀/2

D
2a₀
Question 8
4 / -1

The electron density of E, F₁ & F₂ layers of ionosphere is 2 × 10¹¹, 5 × 10¹¹ and 8 × 10¹¹ m^–3 respectively. What is the ratio of critical frequency for reflection of radiowaves

A
2 : 3 : 4

B
3 : 4 : 5

C
3 : 2 : 5

D
1 : 2 : 7

Solution
Question 9
4 / -1

Light of wavelength λ strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to λ' where :-

A
λ' = λ/2

B
λ' = 2λ

C
λ/2 < λ' < λ

D
λ' > λ

Solution
Question 10
4 / -1

In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a₀ is the radius of the ground state orbit, m is the mass, e is the charge on the electron and ε₀ is the vacuum permittivity, the speed of the electron is

A
0

B

C

D

Solution