Motion (easy)

The instrument that measures and records the relative humidity of air:

• Hydrometer

• Hygrometer

• Lactometer

• Barometer

Instrument used to measure the force and velocity of the wind is ________.

• Ammeter

• Anemometer

• Altimeter

• Audiometer

Equilibrium is a condition that can ________.

• change only if some outside factor changes

• never change

• change only if some internal factor changes

• change only if government policies change

Smog is a general pollutant where:

• temperature is high

• temperature is low

• air contains excess ammonia

• air contains excess sulfur dioxide

Clothes keep us warm in the winter because they _______.

• supply heat

• do not radiate heat

• prevent air from contacting the body

• prevent the heat of the body from escaping

In a refrigerator what produces the cooling?

• the ice which deposits on the freezer

• the sudden expansion of compressed gas

• the evaporation of a volatile liquid

• none of these

A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens dur to ________.

• outward pull on him

• inertia of motion

• change in momentum

• change in acceleration

Longitudinal waves cannot travel through _________.

• vacuum

• solid

• liquid

• gas

Which of the following parts of the sunlight makes the solar cooker hot?

• Ultraviolet light

• Gamma ray

• Infrared

• Cosmic rays

The sky appears blue because of __________.

• atmospheric water vapor

• scattering of light

• reflection of seawater

• Emission of blue wavelength by the sun