Question
Complete the reaction 
(a) 
|
(b) 
|
(c) 
|
(d) 
|
✓
Answer
(a)
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A small, conducting circular loop is placed inside a long solenoid carrying a current. The plane of the loop contains the axis of the solenoid. If the current in the solenoid is varied, the current induced in the loop is:
- Clockwise.
- Anticlockwise.
- Zero.
- Clockwise or anticlockwise depending on whether the resistance in increased or decreased.
The potential energy of a system of two charges is negative when:
In a parallel plate capacitor, the capacity increases if:
Susceptibility of ferromagnetic substance is
|
(a) > 1 |
(b) < 1 |
(c) 0 |
(d) 1 |
Consider a ray of light incident from air onto a slab of glass (refractive index n) of width d, at an angle θ. The phase difference between the ray reflected by the top surface of the glass and the bottom surface is:
A star is going away from the earth. An observer on the earth will see the wavelength of light coming from the star
|
(a) Decreased |
|
(b) Increased |
|
(c) Neither decreased nor increased |
|
(d) Decreased or increased depending upon the velocity of the star |
The figure illustrate how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet
|
(a) OQ should be large, OR should be small |
|
(b) OQ and OR should both be large |
|
(c) OQ should be small and OR should be large |
|
(d) OQ and OR should both be small |
The dielectric strength of a medium is $2 kV mm ^{-1}$ What is the maximum potential difference that can be established across a $50 \mu m$ sample without binding?
→The magnetic field in a coil of 100 turns and 40 square cm area is increased from 1 Tesla to 6 Tesla in 2 second. The magnetic field is perpendicular to the coil. The e.m.f. generated in it is
|
(a) |
(b) 1.2 V |
(c) 1.0 V |
(d) |
When the electrical conductivity of a semi- conductor is due to the breaking of its covalent bonds, then the semiconductor is said to be
|
(a) Donar |
(b) Acceptor |
(c) Intrinsic |
(d) Extrinsic |