Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

The wire wound resistor is also known as:

One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?

1. 25pm
2. 50pm
3. 75pm
4. 100pm

In the given figure, a current of constant magnitude is flowing in the wire AB. Direction of induced current flowing through the wire is:

Isotopes of an element contain:

If the ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be

(a) 24.6 eV

(b) 24.6 V

(c) 13.6 V

(d) 13.6 eV

In water voltameter, the electrolysis of ...... takes place

(a)

(b)

(c)  and   both

(d)  and

A transistor has three impurity regions. All the three regions have different doping levels. In order of increasing doping level, the regions are:

Two source S₁ and S₂ of intensity I₁ and I₂ are placed in front of a screen [Fig. (a)]. The patteren of intensity distribution seen in the central portion is given by Fig. (b).

In this case which of the following statements are true.

The direction of the induced current in the coil can also be found by:

An attractive force of 9N acts between +5C and −5C at some distance. These charges are allowed to touch each other and are then again placed at their initial position. The force acting between them will be: