Current Electricity — Physics STD 12 Science — Question

In Young's interference experiment, the central bright fringe can be identified due to the fact that it:

Which of the following is wrong statement about binding energy?

If the current is doubled, the deflection is also doubled in(a) A tangent galvanometer(b) A moving coil galvanometer(c) Both (a) and (b)(d) None of these

Coulomb's law is a confirmation of______

A closed cubical box is completely filled with water and is accelerated horizontally towards right with an acceleration α. The resultant normal force by the water on the top of the box.

1. Passes through the centre of the top.
2. Passes through a point to the right of the centre.
3. Passes through a point to the left of the centre.
4. Pecomes zeros.

Dynamo core is laminated because(a) Magnetic field increases(b) Magnetic saturation level in core increases(c) Residual magnetism in core decreases(d) Loss of energy in core due to eddy currents decreases

A magnetic field cannot exert any force on a:

Assertion  :  NAND or NOR gates are called digital building blocks.
Reason      : The repeated use of NAND (or NOR) gates can produce all the basic or complicated gates.(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.

For a transistor, the current amplification factor is 0.8. The transistor is connected in common emitter configuration. The change in the collector current when the base current changes by 6 mA is (a) 6 mA(b) 4.8 mA(c) 24 mA(d) 8 mA