A mixture of stream and natural gas passed over a ____ catalyst produces water gas.
a) Copper
b) Nickel
c) Tungsten
d) Zinc
Vinegar is an example _____ in our daily food.
a) Salt
b) Acid
c) Alkali
d) Oil
Explanation: Vinegar is an example of an acid in our daily food. It contains acetic acid, which gives it its acidic properties. Acids are characterized by a pH less than 7 and the ability to donate protons (H+) in chemical reactions.
Latent Heat fusion of ice is:
a) 4.86 x 105 Jkg-1
b) 3.36 x 105 Jkg-1
c) 3.36 x 106 Jkg-1
d) 3.33 x 104 Jkg-1
SI unit of Intensity of light is:
a) Candela
b) Kilogram
c) Kelvin
d) Ampere
Explanation: The SI (International System of Units) unit of intensity of light is the candela (cd). Candela is a base unit of measurement for luminous intensity, which quantifies the amount of light emitted in a particular direction. It is used to measure the brightness or intensity of light sources.
To produce mechanical waves, we need a source producing a disturbance and a/an:
a) Inelastic medium
b) Elastic medium
c) Electromagnetic field
d) Vacuum
Explanation: To produce mechanical waves, an elastic medium is required. Mechanical waves rely on the ability of the medium's particles to oscillate and transmit energy through their elastic properties. This allows the wave to propagate as the disturbance from the source is transferred through the medium.
The distance between the focal point and optical canter is called:
a) Principal axis
b) Principal focus
c) Optical center
d) Focal length
Explanation:
