Which of the following is a base quantity in SI Unit?
a) Mass
b) Area
c) Volume
d) Density
Explanation: Base quantities are physical quantities that cannot be defined in terms of other quantities.
What determines the pitch of sound?
a) Frequency
b) Speed
c) Direction
d) Number of beats
Explanation: The pitch of sound is determined by its frequency. Frequency refers to the number of cycles or vibrations per unit of time, and it directly relates to the perceived pitch of a sound. Higher frequency sounds are perceived as higher pitched, while lower frequency sounds are perceived as lower pitched. Speed, direction, and the number of beats are not directly related to the pitch of sound.
Calcareous soils are relatively:
a) Acidic in nature
b) Neutral in nature
c) Alkaline in nature
d) Amphoteric in nature
Explanation: Calcareous soils are characterized by having a high concentration of calcium carbonate (lime). Calcium carbonate is an alkaline compound, which raises the pH of the soil and makes it alkaline in nature. These soils typically have a pH value above 7, indicating their alkalinity.
During quantitative analysis, theoretical composition of a chemical reaction is indicated by its.
a) Endpoint
b) Equivalence point
c) Precipitation point
d) Limited reagent point
Some compounds on heating decomposes is simpler compound or elements. This type of reaction is called.
a) Additional reaction
b) Decomposition reaction
c) Process of respiration
d) Replication of DNA
PAKISTAN STUDIES
