Physics 2nd Half Book Test

If the length of the conductor becomes half and the area is doubled then the resistance decreases by

• 2 Times

• 4 Times

• 8 times

• None of these

Of the following, the one which has a positive temperature Co-efficient of resistance     is:

• Carbon

• Germanium

• Copper

• An electrolyte

An atomic nucleus has mass

• Less than the total mass of their constituent protons and neutrons

• Equal to the total mass of their constituent protons and neutrons

• More than the total mass of their constituent protons and neutrons

• Sometimes more and sometimes less than the total mass of their constituent protons and neutrons

Radioactive substance do not emit

• Neutrons

The ratio of radius of 3rd to 1st Bohr’s orbit is

• 3:1

• 9:1

• 1:3

• None

Which one of the following radiations has more energy photons?

• Radio waves   

• Micro waves

The radius of 10th orbit of hydrogen atom is

• 0.53nm

• 53 nm

• 5.3 nm

• 0.053 x 10^-9 nm

In photoelectric effect, which factor increases by increasing the intensity of incident photon?

• Kinetic energy of electrons

• Work function

• Stopping potential

• Number of emitted electrons

In photoelectric effect, if the intensity of light in made twice than initial value. The maximum K.E of photoelectron becomes

• Same

• Four times

• Double

• Half

A Baryon is formed by                                quarks.

• 4

• 6

• 3

• 10