- A1.66 × 10–19c/ kg.
- B9.1 × 1011c/ kg.
- C1.76 × 1011c/ kg.
- D9.1 × 1019c/ kg.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The galaxies are moving away from each other. It is explained by
|
(a) White dwarf star |
(b) Red shift |
(c) Neutron star |
(d) None of these |
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 |
The equivalent resistance between points A and B of an infinite network of resistances each of 1Ω connected as shown, is
|
(a) Infinite |
(b) 2 Ω |
(c) |
(d) Zero |
Two charges +3.2
and -3.2
kept 2.4 Å apart forms a dipole. If it is kept in uniform electric field of intensity 4
then what will be its electrical energy in equilibrium
|
(a) + 3 |
(b) -3 |
(c) -6 |
(d) -2 |
A copper wire of resistance R is cut into ten parts of equal length. Two pieces each are joined in series and then five such combinations are joined in parallel. The new combination will have a resistance
|
(a) R |
(b) |
(c) |
(d) |
The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength λ for sodium is
, the value of λ for tungsten is
|
(a) 5893 Å |
(b) 10683 Å |
(c) 2791 Å |
(d) 528 Å |
Assertion : The ionising power of b-particle is less compared to a-particles but their penetrating power is more.
Reason : The mass of b-particle is less than the mass of a-particle.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |