On a rainy day, small oily films on water show brilliant colours. This is due to

• scattering

• dispersion

• refraction

• polarisation

122.

Which of the following instrument is used to measure Soil Water Tension?

• Photometer

• Pyrometer

• Psychrometer

• Tensiometer

What is the S.I unit of Force?

• Pascal

• Boyle

• Newton

• Watt

Meter in a vehicle that calculates distance covered by the vehicle is called .................

• Speedometer

• Odometer

• Thermometer

• Kilometre

What is the SI unit of pressure?

• Newton

• Weber

• Pascal

• Henry

Reflection from a smooth surface like that of a mirror is called ...............reflection.

• regular

• irregular

• diffused

• fused

What is the unit of resistance?

• Ohm

• Farad

• Henry

• Weber

Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?

• Pyrometer

• Thermocouple

• Thermometer

• Thermistor

Gravitational force is maximum at which of the following?

• At equator

• At tropic of cancer

• At tropic of capricorn

• At poles

Which of the following device is used to measure humidity?

• Hydrometer

• Hygrometer

• Psychometer

• Anemometer