CBSE class 9 Science Quiz | CBSE class 9 Science MCQs & Answers

Questions
81 Number of neutrons present in Hydrogen atom is _______.
A 0
B 3
C 1
D 2

Answer: 0
82 In an atom, the mass number of an atom is equal to the number of _________________.
A nucleons
B neutrons
C protons
D electrons

Answer: nucleons
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83 Rutherford's gold foil experiment showed that most of the α-particles passed through the gold foil without any deflection. It indicates that
A the nucleus carries the most of the mass
B there is lot of empty space in atom
C the nucleus is concentrated at the centre
D the nucleus carries positive charge

Answer: there is lot of empty space in atom
84 An α-particle is _____________
A an electron
B a Hydrogen nucleus
C a Helium nucleus
D a proton

Answer: a Helium nucleus
85 α-particles are ___________
A negative charged particles
B positive charged particles
C beam of neutrons
D gamma radiation

Answer: negative charged particles
86 Canal rays are _______________
A positive charged particles
B gamma radiation
C negative charged particles
D beam of neutrons

Answer: positive charged particles
87 Proton was discovered by:
A J.J. Thomson
B Rutherford
C Goldstein
D Chadwick

Answer: Goldstein
88 Which cell organelle plays a crucial role in detoxifying many poisons and drugs?
A Smooth Endoplasmic Reticulum
B Vacuoles
C Golgi Apparatus
D Lysosomes

Answer: Smooth Endoplasmic Reticulum
89 Which of the following organelle is present onion cells but not in human cheek cells?
A plasma membrane
B cell wall
C cytoplasm
D nucleus

Answer: cell wall
90 Plastids which are responsible for giving colors to fruits and flowers are
A chromoplasts
B protoplasts
C chloroplasts
D leucoplasts

Answer: chromoplasts
91 Which organelle is considered as a suicide bag?
A Chromosome
B Lysosomes
C Centrosome
D Mesosomes

Answer: Lysosomes
92 Chromosomes are made up of nucleic acid and _________
A Calcium
B Phosphorus
C Protein
D Sugar

Answer: Protein
93 Which organelle is the power house of the cells?
A Mitochondria
B Nucleus
C Plastids
D Golgi

Answer: Mitochondria
94 Function of centriole is
A cell division initiation
B nucleolus formationation
C cell wall formation
D formation of spindle fibre

Answer: formation of spindle fibre
95 The main constituent of cell-wall is:
A cellulose
B protein
C Starch
D none of these

Answer: cellulose
96 Who used the word ‘protoplasm first time for living cells?
A Robert Brown
B Purkinje
C Robert Hooke
D Leeuwenhoek

Answer: Purkinje
97 Which of the following can be made into crystal?
A A virus
B A sperm
C A bacterium
D An Amoeba

Answer: A virus
98 Who discovered the first living cell?
A Leeuwenhoek
B Purkinje
C Robert Hooke
D None

Answer: Leeuwenhoek
99 Mitochondria are found
A only in plant cells
B in eukaryote cells only
C in all type of living cells
D only in animal cells

Answer: in eukaryote cells only
100 Muscles contain special proteins called ________ that help in muscle movement.
A nucleo proteins (DNA, RNA)
B contractile proteins (actin and myosin)
C recptor proteins
D enzymes

Answer: contractile proteins (actin and myosin)
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