Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure. Which curve is correct
|
(a) A |
(b) B |
(c) C |
(d) D |
(c) C
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A metallic solid sphere is placed in a uniform electric field. The lines of force follow the path(s) shown in figure as
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to
(a) 
|
(b) 
|
(c) 1/
|
(d) 1/V |
In the Bohr's hydrogen atom model, the radius of the stationary orbit is directly proportional to (n = principle quantum number)
|
(a) |
(b) n |
(c) |
(d) |
Let V and H be the vertical and horizontal components of earth's magnetic field at any point on earth. Near the north pole
|
(a) V >> H |
(b) V << H |
(c) V = H |
(d) V = H = 0 |
A metal rod of length 2 m is rotating with an angular velocity of 100 rad/sec in a plane perpendicular to a uniform magnetic field of 0.3 T. The potential difference between the ends of the rod is
|
(a) 30 V |
(b) 40 V |
(c) 60 V |
(d) 600 V |
A torch bulb rated as 4.5 W, 1.5 V is connected as shown in the figure. The e.m.f. of the cell needed to make the bulb glow at full intensity is
|
(a) 4.5 V |
(b) 1.5 V |
(c) 2.67 V |
(d) 13.5 V |
Match List I with List II and select the correct answer using the codes given below the lists :
|
List I (Position of the object) |
List II (Magnification) |
|
(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 |
|
(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 :
|
(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 |
A lens (focal length 50 cm) forms the image of a distant object which subtends an angle of 1 milliradian at the lens. What is the size of the image
|
(a) 5 mm |
(b) 1 mm |
(c) 0.5 mm |
(d) 0.1 mm |
