Assertion(A): A rainbow is formed due to dispersion, refraction and internal reflection of light in water droplets.

Reason (R) : On entering the water droplet, white light splits in to seven colour then internally reflected and refracted before coming out of the droplet.

Assertion(A): Nichrome wire is generally used as an element in heating devices such as electric heater, geyser etc.

Reason (R): Nichrome is an alloy having high resistivity and it does not oxidize at higher temperature.

Assertion(A): An electron entering at right angle to an external magnetic field experiences no force.

Reason (R): The direction of force on a current carrying wire placed in a magnetic field can be determined by using Fleming's left hand rule.

Assertion(A): The white colour of the clouds is due to scattering of light.

Reason (R) : Large water droplets present in the clouds scatter light of all wavelengths.

Assertion(A): A prism can split white light into 7 colours.

Reason (R): The refractive index of the material of prism is different for different wavelengths of light.

Assertion(A): Bifocal lenses are used to correct Presbyopia.

Reason (R): In presbyopia, the eye lens gets cloudy or milky which leads to partial or complete loss of vision.

Assertion(A): A stationary charged particle placed in a magnetic field experiences no force.

Reason (R): A stationary charged particle produces  strong magnetic field.

Assertion(A): Concave lenses are used in camera to focus the image.

Reason (R): Concave lenses are diverging lenses.

Assertion(A): To obtain the lowest resistance using fours resistors of resistance 3Ω, 4Ω, 9Ω, and 12Ω, we should connect them in parallel.

Reason (R): Potential difference is same across all resistors in parallel combination.

Assertion(A): Silver metal is not used to make wires for electricity transmission.

Reason (R): Silver metal is too expensive to be used as an electrical wire for transmission of electricity.