MASTER MINDS (QUALIFYING ROUND)

The coil in a heater is made of?

• Tungsten

• Nichrome

• Iron

• Copper

Which of the following cannot be emitted by radioactive substances during their decay?

• Electrons

• Neutrons

• Protons

• Helium

When light passes from one medium to another medium, which one of the following does not change?

• Frequency

• Wavelength

• Velocity

• Intensity

Who developed the atom bomb?

• Robert Opan Heemar

• Bernor Bon Bron

• Adberd Taylor

• Samual Cohen

Which one of the following phenomena shows particle nature of light?

• Photo electric effecT

• Interference

• Refraction

• Polarisation

Pa (Pascal) is the unit of

• Thrust
• Pressure
• Frequency
• Conductivity

Light from the sun reaches us in nearly

• 2 minutes
• 4 minutes
• 8 minutes
• 16 minutes

The wavelength of He-Ne laser is :

• 630nm

• 632.8nm

• 640nm

• 700nm

In an optical fibre:

• refractive index of core and cladding are same

• refractive index of cladding is greater than that of core

• refractive index of core is greater than that of cladding

• none of above

The ferromagnetic materials are :

• Weakly repelled by magnetic field

• Strongly repelled by magnetic field

• Strongly attracted by magnetic field

• none of the above