What is the S.I. unit of electric current?

• Newton

• Joule

• Ampere

• Watt

If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used

• Concave

• Convex

• Cylindrical

• Plane

What is the S.I. unit of temperature?

• Kelvin

• Joule

• Celsius

• Fahrenheit

Soap bubble attains spherical shape due to..........

• inertia

• pressure

• surface tension

• viscosity

Optical fibre works on which of the following principle of light?

• Reflection

• Refraction

• Diffraction

• Total internal reflection

Why does the tank appear shallower when viewed from the top?

• Due to reflection

• Due to refraction

• Due to diffraction

• Due to total internal reflection

At which of the following place, weight of an object is maximum?

• At poles

• At equator

• At tropic of Capricorn

• At tropic of cancer

Electric Motor converts ................ energy to mechanical energy.

• sound

• mechanical

• chemical

• electrical

Which among the following determines the pitch of a sound?

• Amplitude

• Frequency

• Loudness

• Wavelength

Which of the following is a characteristic of an exothermic reaction?

• Release of heat

• Absorption of heat

• Doesn't involve any change in temperature

• None of the option is correct