Which of the following statement is wrong
|
(a) Voltmeter should have high resistance |
|
(b) Ammeter should have low resistance |
|
(c) Ammeter is placed in parallel across the conductor in a circuit |
|
(d) Voltmeter is placed in parallel across the conductor in a circuit |
(c) Ammeter is placed in parallel across the conductor in a circuit
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If work function of metal is 3eV then threshold wavelength will be
|
(a) 4125 Å |
(b) 4000 Å |
(c) 4500 Å |
(d) 5000 Å |
Atom bomb consists of two pieces of 
and a source of
|
(a) Proton |
(b) Neutron |
(c) Meson |
(d) Electron |
In a Young's experiment, two coherent sources are placed 0.90 mm apart and the fringes are observed one metre away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic light used would be
|
(a) 60 |
(b) 10 |
(c) 10 |
(d) 6 |
There are certain types of stars called visible stars which undergo periodic change in their light output. If such a star quadruple it's light output, how much does it's magnitude change
|
(a) – 1.25 |
(b) – 1.5 |
(c) – 1.75 |
(d) – 2 |
In given figure, the potentiometer wire AB has a resistance of 5 W and length 10 m. The balancing length AM for the emf of 0.4 V is
|
(a) 0.4 m |
(b) 4 m |
(c) 0.8 m |
(d) 8 m |
A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointing in the same direction
|
(a) The electron will turn to its right |
|
(b) The electron will turn to its left |
|
(c) The electron velocity will increase in magnitude |
|
(d) The electron velocity will decrease in magnitude |
In a tangent galvanometer a current of 0.1 A produces a deflection of 30o. The current required to produce a deflection of 60o is
|
(a) 0.2 A |
(b) 0.3 A |
(c) 0.4 A |
(c) 0.5 A |
The electron in a hydrogen atom makes a transition 
, where 
and 
are the principal quantum numbers of the two states. Assume the Bohr model to be valid. The time period of the electron in the initial state is eight times that in the final state. The possible values of n1 and n2 are
|
(a) |
(b) |
(c) |
(d) |
A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4D, the power of a cutlens will be:
