Question

From the graph between current I and voltage V shown below, identify the portion corresponding to negative resistance

(a) AB

(b) BC

(c) CD

(d) DE

Answer

(c) CD

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In the following figure, the magnet is moved towards the coil with a speed v and induced emf is e. If magnet and coil recede away from one another each moving with speed v, the induced emf in the coil will be

(a) e

(b) 2e

(c) e/2

(d) 4e

The cause of the potential barrier in a P-N diode is

(a) Depletion of positive charges near the junction

(b) Concentration of positive charges near the junction

(c) Depletion of negative charges near the junction

(d) Concentration of positive and negative charges near the junction

10 wires (same length, same area, same material) are connected in parallel and each has 1 Ω resistance, then the equivalent resistance will be

(a) 10 Ω  

(b) 1 W

(c) 0.1 W 

(d) 0.001 W

The magnitude and direction of the current in the circuit shown will be

(a)  A from a to b through e

(b)  A from b to a through e

(c) 1 A from b to a through e

(d) 1 A from a to b through e

The intensity of electric field at a point between the plates of a charged capacitor

(a) Is directly proportional to the distance between the plates

(b) Is inversely proportional to the distance between the plates

(c) Is inversely proportional to the square of the distance between the plates

(d) Does not depend upon the distance between the plates

At the centre (t = 0) of Newton's ring arrangement, we observe a:
Two bodies A and B of equal mass are suspended from two separate massless springs of spring constant k1 and k2 respectively. If the bodies oscillate vertically such that their maximum velocities are equal, the ratio of the amplitude of A to that of B is:

  1. $\frac{\text{k}_1}{\text{k}_2}$

  2. $\sqrt{\frac{\text{k}_1}{\text{k}_2}}$

  3. $\frac{\text{k}_2}{\text{k}_1}$

  4. $\sqrt{\frac{\text{k}_2}{\text{k}^1}}$

Assertion  : Isobars are the element having same mass number but different atomic number.

Reason      : Neutrons and protons are present inside nucleus.

(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.

The temperature of a solid object is observed to be constant during a period. In this period:
  1. Heat may have been supplied to the body.
  2. Heat may have been extracted from the body.
  3. No heat is supplied to the body.
  4. No heat ia ertracted from the body.

The capacitance of an air filled parallel plate capacitor is 10μμF . The separation between the plates is doubled and the space between the plates is then filled with wax giving the capacitance a new value of 40. The dielectric constant of wax is

(a) 12.0   

(b) 10.0

(c) 8.0

(d) 4.2