- ATo provide potential energy to electrons
- BTo provide kinetic energy to protons
- CTo provide potential energy to protons
- DTo provide kinetic energy to electrons
Explanation:
In a Cathode ray tube electrons comes out from cathode. After cathode, anode is placed, which as being +ively charged, accelerates electrons and provide them kinetic energy.
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There is no couple acting when two bar magnets are placed coaxially separated by a distance because
|
(a) There are no forces on the poles |
|
(b) The forces are parallel and their lines of action do not coincide |
|
(c) The forces are perpendicular to each other |
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(d) The forces act along the same line |
In a Young's double slit experiment, the slits are 2 mm apart and are illuminated with a mixture of two wavelength
and λ = 900 nm. The minimum distance from the common central bright fringe on a screen 2m from the slits where a bright fringe from one interference pattern coincides with a bright fringe from the other is
|
(a) 1.5 mm |
(b) 3 mm |
(c) 4.5 mm |
(d) 6 mm |
A triangular loop of side l carries a current I. It is placed in a magnetic field B such that the plane of the loop is in the direction of B. The torque on the loop is
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(a) Zero |
(b) IBl |
(c) |
(d) |
When the object is self-luminous, the resolving power of a microscope is given by the expression
|
(a) |
(b) |
(c) |
(d) |
Match List I with List II and select the correct answer using the codes given below the lists :
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List I (Position of the object) |
List II (Magnification) |
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(I) An object is placed at focus before a convex mirror |
(A) Magnification is -∞ |
|
(II) An object is placed at centre of curvature before a concave mirror |
(B) Magnification is 0.5 |
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(III) An object is placed at focus before a concave mirror |
(C) Magnification is +1 |
|
(IV) An object is placed at centre of curvature before a convex mirror |
(D) Magnification is -1 |
|
|
(E) Magnification is 0.33 |
Codes :
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(a) I-B, II-D, III-A, IV-E |
(b) I-A, II-D, III-C, IV-B |
|
(c) I-C, II-B, III-A, IV-E |
(d) I-B, II-E, III-D, IV-C |
Magnetic fields at two points on the axis of a circular coil at a distance of 0.05m and 0.2m from the centre are in the ratio 8 : 1. The radius of the coil is
|
(a) 1.0 m |
(b) 0.1 m |
(c) 0.15 m |
(d) 0.2 m |
A heavenly body is receding from earth such that the fractional change in l is 1, then its velocity is
|
(a) C |
(b) |
(c) |
(d) |