This document contains a set of 14 physics questions with multiple choice answers. The questions cover topics such as thermodynamics, ideal gases, heat transfer, electromagnetism, and motion of charged particles in electric and magnetic fields. For each question there is a short description or diagram and 4 possible answers labelled A, B, C, or D. The correct answer is indicated in bold following each question.
This document contains a set of 14 physics questions with multiple choice answers. The questions cover topics such as thermodynamics, ideal gases, heat transfer, electromagnetism, and motion of charged particles in electric and magnetic fields. For each question there is a short description or diagram and 4 possible answers labelled A, B, C, or D. The correct answer is indicated in bold following each question.
This document contains a set of 14 physics questions with multiple choice answers. The questions cover topics such as thermodynamics, ideal gases, heat transfer, electromagnetism, and motion of charged particles in electric and magnetic fields. For each question there is a short description or diagram and 4 possible answers labelled A, B, C, or D. The correct answer is indicated in bold following each question.
This document contains a set of 14 physics questions with multiple choice answers. The questions cover topics such as thermodynamics, ideal gases, heat transfer, electromagnetism, and motion of charged particles in electric and magnetic fields. For each question there is a short description or diagram and 4 possible answers labelled A, B, C, or D. The correct answer is indicated in bold following each question.
If a monoatomic gas undergoes a thermodynamic process for which its molar heat capacity is equal to the universal gas constant. What is the process in terms of V and T?
3 (A) V 1/2 T = constant (B) VT 1/2 = constant (C) V 2 T 2 = constant (D) VT = constant B
A cyclic process is shown in the figure. for the process AB which of the following statement is correct?
(A) Heat given to the system will be always –ve throughout the process (B) Heat given to the system will be always +ve throughout the process (C) First the heat given is +ve then –ve throughout the process (D) First the heat given is –ve then +ve throughout the process C
A hollow sphere of inner radius R and outer radius 2R is made of a material of
thermal conductivity K. It is surrounded by another hollow sphere of inner radius 2R and outer radius 3R made of same material of thermal conductivity K. The inside of smaller sphere is maintained at 0°C and the outside of bigger sphere at 100°C. The system is in steady state. The temperature of the interface will be : 7 (A) 50°C (B) 70°C (C) 75°C (D) 45°C C
Consider a given amount of an ideal gas. The gas is contained in a cylinder. Fig. shows two isotherms 1 and 2 at temperatures T1 and T2 . An isotherm represents a process that the gas undergoes at a constant temperature. Consider the paths A → C and A → B . Heat transferred to the gas along A → C will be
(A) more than that for the path A → B .
(B) less than that for the path A → B . (C) the same as that for the path A → B . (D) more if the gas is monatomic and less if the gas is diatomic or polyatomic B
A charge particle of mass m and charge q is projected with a velocity v at a distance
d from a long straight current carrying conductor. The radius of curvature of the path traced by the particle at the given position does not depend on :
→ ^ ^ A charge particle has velocity v = v( i + k ) in the magnetic field at the origin. Its speed as the function of y is :
14
−−−−−−−− qE (A) √v2 + y 2E −−−−−−−−−−−−−−−− 2 B qE (B) √( ) 2 + v + y E 2m −−−− −−−−− 2qE (C) 2 √v + y m
(D) none of the above
C
→ ^ ^ A proton is fired from origin with velocity V = V0 j + V0 k . in a uniform magnetic → ^ field B = B0 j . . In the subsequent motion of the proton
15 (A) its z – coordinate can never be negative
(B) its x – coordinate can never be positive (C) its x – and z – coordinates cannot be zero at the same time (D) its y – coordinate will be independent of its time. B
Two electrons are moving with the same velocity v parallel to each other and separated by a certain distance. Which of the following statements is wrong?
(A) Magnitude of magnetic force between the electrons depends on frame of
reference and is different in different frames, even if the frames considered are all inertial with respect to each other (B) Attract each other when seen from the frame w.r.t which velocity ‘v’ is measured 16 in any real life situation (v < velocity of light in vacuum) (C) Net real force on an object should be same when measured from any frame of reference, inertial or not (D) The angular momentum of one electron will be conserved w.r.t a point attached to the other electron, no matter what the value of ‘v’ maybe (including imaginary situations where v> velocity of light) B
A charged particle of mass m and charge q is projected onto a rough plane of
coefficient of friction μ with a speed v0 . A uniform magnetic field of strength B acts v0 perpendicular into this plane. The radius of curvature of the path after a time is 2μg
A cube made of wires of equal length is connected to a battery as shown in the
figure. The magnetic field at the centre of the cube is
18
12μ0 I (A) – √2πL
6μ0 I (B) – √2πL
6μ0 I (C) πL
(D) Zero D
If a charged spherical hollow shell is spinning, and the ratio of it’s magnetic moment to magnetic field at it’s center is x, then, if charge on the ring, angular velocity and radius of the ring are all doubled, what will be the new ratio of same?
Two wires are of same length and same area of cross-section. If first wire has resistivity ρ1 and temperature coefficient of resistance α1 but second wire has resistivity ρ2 and temperature coefficient of resistance α2 . Their series equivalent resistance is independent of small temperature changes. Then
20 (A) α1 + α2 = 0
(B) ρ1 α1 = ρ2 α2
(C) ρ1 α1 + ρ2 α2 = 0
(D) ρ1 α2 + ρ2 α1 = 0
Find the line integral of magnetic field in the region when travelling along the loop shown in the diagram: ¯ ¯ If answer is ϕB . dl = μ0 ni , what is the value of ‘n’?
21
3_3
Three rods made of the same material and having the same cross-section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at 0°C and 90°C respectively. The temperature of junction of the three rods is 10 T°C, then the value of T is ?
A body cools from 62°C to 50°C in 10 min when the temperature of the surrounding is 26°C. What is the decrease in the temperature(in°0C) in the next 10 min is 23 approximately? 8_8
A proton and an α− particle enter a uniform magnetic field perpendicular with the same speed. If the proton takes 25 μ s to make 5 revolutions, then the periodic time 24 for the α− particle would be 2x μ s. Then x = ? 5_5
A rod of length I and total charge q which is uniformly distributed, is rotating with angular velocity ω about an axis passing through the centre of rod and perpendicular 25 to rod find the magnitude of magnetic dipole moment (in Am ) 2 of rod, if q = 4C, ω = 3 rad/sec and I = 2m. 2_2
