Bonding in a germanium crystal (semi- conductor) is
| (a) Metallic | (b) Ionic |
(c) Vander Waal's type |
(d) Covalent |
Bonding in a germanium crystal (semi- conductor) is
| (a) Metallic | (b) Ionic |
(c) Vander Waal's type |
(d) Covalent |
(d) Covalent
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is
seconds. One of the magnets is removed and if the other magnet oscillates in the same field, then the time period in seconds is
|
(a) |
(b) |
(c) 2 |
(d) |
The diameter of each plate of an air capacitor is 4 cm. To make the capacity of this plate capacitor equal to that of 20 cm diameter sphere, the distance between the plates will be
|
(a) 4 |
(b) 1 |
(c) 1 cm |
(d) 1 |
$\lambda\geq\lambda_0$
$\lambda\geq2\lambda_0$
$\lambda\leq\lambda_0$
$\lambda<\frac{\lambda_ 0}{2}.$
In the figure, an air lens of radii of curvature 10 cm (= 10 cm) is cut in a cylinder of glass (μ = 1.5). The focal length and the nature of the lens is
|
(a) 15 cm, concave |
(b) 15 cm, convex |
|
(c) ∞, neither concave nor convex |
(d) 0, concave |
The diagram shows the path of four a-particles of the same energy being scattered by the nucleus of an atom simultaneously. Which of these are/is not physically possible

|
(a) 3 and 4 |
(b) 2 and 3 |
(c) 1 and 4 |
(d) 4 only |
Two capacitances of capacity and
are connected in series and potential difference V is applied across it. Then the potential difference across
will be
|
(a) |
(b) |
(c) |
(d) |
An amplitude modulated wave is modulated to 50%. What is the saving in power if carrier as well as one of the side bands are suppressed
|
(a) 70% |
(b) 65.4% |
(c) 94.4% |
(d) 25.5% |