In P-N junction having depletion layer of thickness 10⁻⁶ m, the potential across it is 0.1 V. The electric field is
Options
(a) 10⁷ (b) 10⁻⁶ (c) 10⁵ (d) 10⁻⁵
Correct Answer:
10⁵
If X=3YZ², find dimensions of Y if X and Z are the dimensions of capacity and magnetic field(induction) respectively
Options
(a) M⁻³L⁻²T⁻⁴A⁻¹ (b) ML⁻² (c) M⁻³L⁻²T⁴A⁴ (d) M⁻³L⁻²T⁸A⁴
Correct Answer:
M⁻³L⁻²T⁸A⁴
Explanation:
No […]
An air core solenoid has 1000 turns and is one meter long. Its cross sectional area is 10 cm². Its self inductance is
Options
(a) 0.1256 mH (b) 12.56 mH (c) 1.256 mH […]
Ring, hollow ring and solid sphere are rolled down from inclined plane. Which will take less time to reach the ground?
Options
(a) Solid Sphere (b) Hollow Sphere (c) Ring (d) Hollow Sphere […]
A bullet comes out of the barrel of gun of length 2m with a speed of 800 m/s. The average acceleration of the bullet is
Options
(a) 160 m/s² (b) 60 km/s² (c) […]
A body of mass m=3.513 kg is moving along the x-axis with a speed of 5 m/s. The magnitude of its momentum is recorded as
Options
(a) 17.57 kg m/s (b) 17.6 kg […]
A neutron moving with velocity v collides with a stationary particle. The velocity of the neutron after the collision is
Options
(a) -3v/5 (b) 3v/5 (c) 2v/5 (d) -2v/5
Correct Answer:
-3v/5
Explanation: […]
A body is thrown with a velocity of 9.8 m/s making angle of 30° with the horizontal. It will hit the ground after a time
Options
(a) 1.5 secs (b) 1 sec (c) […]
The angular speed of earth, so that the object on equator may appear weightless is(g = 10 m/s², radius of earth=6400 km)
Options
(a) 1.25 x 10⁻³ rad/s (b) 1.56 x 10⁻³ rad/s […]
Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100 V. The self inductance of the coil is
Options
(a) 0.25 H (b) 0.4 […]
2017 Copyright Doctor Dreams Training Academy