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Class 9 MCQs for UPPSC (UP) Exam

It covers all Important Questions with answers on Class 9 for the UPPSC (UP) exam. The questions are based on important topics. Details about the questions:
  • Topic: Class 9
  • Type of Questions: MCQs with solutions
  • Number of Questions: 50
  • You can attempt them on EduRev to score high in UPPSC (UP) exam.

Living cells were discovered by
  • a)
    Robert Hooke
  • b)
    Purkinje
  • c)
    Leeuwenhoek
  • d)
    Robert Brown
Correct answer is option 'C'. Can you explain this answer?

Anita Menon answered
Robert Hooke, a scientist, was the first person to discover the existence of cells with the help of a microscope in 1665 but they were dead cells.
Anton van Leeuwenhoek, in 1674 with the improved microscope, discovered free-living cells of algae Spirogyra in pond water for the first time.

The combining capacity of an element is called 
  • a)
    Valency 
  • b)
    Atomicity 
  • c)
    Atomic number 
  • d)
    Valence electron
Correct answer is option 'A'. Can you explain this answer?

Aditi Sharma answered
  • The combining capacity of an element is known as its valency.
  • Valency is the number of valence electrons in outer shell that take part in the chemical reaction.

Which of the following is not a mixture? 
a) Soap solution
b) Blood
c) Carbon dioxide
d) Coal
Correct answer is option 'C'. Can you explain this answer?

Gaurav Kumar answered
Carbon dioxide is not a mixture since it contain fixed ratio of oxygen and carbon in 2:1, which is a property of compound not a mixture.

A desert is ...................
  • a)
    an endless stretch of sand
  • b)
    without rainfall
  • c)
    without vegetation
  • d)
    all of the above
Correct answer is option 'D'. Can you explain this answer?

Parth Nambiar answered
Desert

Desert is a geographical region that is characterized by extreme dryness and lack of precipitation. It is a vast expanse of land that receives very little rainfall, and as a result, vegetation is scarce, and sand is abundant.

Endless stretch of sand

Deserts are often associated with endless stretches of sand dunes, but this is not always the case. While sand dunes are a common feature of many deserts, there are also rocky deserts, and deserts that are characterized by vast plains of gravel and dirt.

Without rainfall

Deserts are defined by their lack of rainfall, with many receiving less than 10 inches of rain per year. This lack of rainfall is often due to their location, such as being situated in areas that are far from oceans or other moisture sources.

Without vegetation

The extreme dryness of deserts means that vegetation is scarce, with many deserts being home to only a few types of plants that are adapted to the harsh desert environment. These plants often have specialized adaptations to help them survive in the arid conditions, such as the ability to store water in their leaves or roots.

All of the above

In conclusion, deserts are characterized by their lack of rainfall, scarcity of vegetation, and often vast stretches of sand or rocky terrain. These features make deserts some of the most inhospitable places on Earth, but they are also home to a variety of unique and fascinating plant and animal species that have adapted to the harsh desert environment.

Identify the correct symbol of Gold. 
  • a)
    Go 
  • b)
    Gd 
  • c)
    Ge 
  • d)
    Au 
Correct answer is option 'D'. Can you explain this answer?

Aditi Sharma answered
The chemical symbol for gold is Au, taken from the Latin word for gold- Aurum. Its atomic number is 79.

The atom is indivisible, was proposed by
  • a)
    Einstein
  • b)
    Lavoisier
  • c)
    Dalton
  • d)
    Proust
Correct answer is option 'C'. Can you explain this answer?

Yes john Dalton say this first but this was expect after because this is made up of electron protein and nuetron

The smell of hydrogen sulphide (H2S) gas
  • a)
    pleasant
  • b)
    of rotten egg
  • c)
    of burning sulphur
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?

Pooja Shah answered
Hydrogen sulfide is a flammable, colorless gas with a characteristic odour of rotten eggs. It is commonly known as hydrosulfuric acid, sewer gas, and stink damp. People can smell it at low levels.

The cell organelles (other than the nucleus) which contain DNA are
  • a)
    plastids and lysosomes
  • b)
    mitochondria and Golgi apparatus
  • c)
    Golgi apparatus and lysosomes
  • d)
    plastids and mitochondria
Correct answer is option 'D'. Can you explain this answer?

Mohit Rajpoot answered
Both mitochondria and plastids possess  their  own genetic material and ribosomes .
The mitochondria DNA and plastid DNA possess genes which produce the proteins necessary for the functioning  of mitochondria and plastids  respectively. 

Na+ has 12 neutrons and 10 electrons. Which of the following statement is correct?
  • a)
    Na+ has atomic number equal to 10 and mass number 22 
  • b)
    Na+ has atomic number equal to 11 and mass number 23
  • c)
    Na+ has atomic number equal to 10 and mass number 23  
  • d)
    Na+ has atomic number equal to 11 and mass number 22
Correct answer is option 'B'. Can you explain this answer?

Geetika Shah answered
The chemical symbol Na+ represents a sodium ion. The atomic number of sodium (Na) is 11, which means it has 11 protons.
Given that Na+ has 12 neutrons, we can determine the mass number by adding the number of neutrons to the number of protons. So, for Na+:
Mass number = Number of neutrons + Number of protons Mass number = 12 neutrons + 11 protons Mass number = 23
The atomic number remains unchanged because it is determined by the number of protons, which is characteristic of each element. The loss or gain of electrons to form ions does not change the atomic number.
Therefore, the correct statement is: Na+ has an atomic number equal to 11 and a mass number of 23.

If a plant cell is kept in a hypotonic solution, it will
  • a)
    Increase in its volume
  • b)
    Maintain the same volume
  • c)
    Decrease in its volume
  • d)
    Burst
Correct answer is option 'A'. Can you explain this answer?

Hansa Sharma answered
When the plant cell is placed in a hypotonic solution , it takes up water by osmosis and starts to swell, but the cell wall prevents it from bursting.

Which one of the following phrases would be incorrect to use?
  • a)
    A mole of an element
  • b)
    A mole of a compound
  • c)
    An atom of an element
  • d)
    An atom of a compound
Correct answer is option 'D'. Can you explain this answer?

Krishna Iyer answered
 it  will be incorrect to say that  an  atom of  a compound   because, 
Every combination of atoms is a molecule. A compound is a molecule made of atoms  from different elements. All compounds are molecules , but not all molecules are compounds.

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