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Free download in PDF CBSE class 9 Science MCQs & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 9 Students.
81
Number of neutrons present in Hydrogen atom is _______.
82
In an atom, the mass number of an atom is equal to the number of _________________.
[A]
nucleons
[B]
neutrons
[C]
protons
[D]
electrons
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
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
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
90
Plastids which are responsible for giving colors to fruits and flowers are
[A]
chromoplasts
[B]
protoplasts
[C]
chloroplasts
[D]
leucoplasts
91
Which organelle is considered as a suicide bag?
[A]
Chromosome
[B]
Lysosomes
[C]
Centrosome
[D]
Mesosomes
92
Chromosomes are made up of nucleic acid and _________
[A]
Calcium
[B]
Phosphorus
[C]
Protein
[D]
Sugar
93
Which organelle is the power house of the cells?
[A]
Mitochondria
[B]
Nucleus
[C]
Plastids
[D]
Golgi
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
96
Who used the word ‘protoplasm first time for living cells?
[A]
Robert Brown
[B]
Purkinje
[C]
Robert Hooke
[D]
Leeuwenhoek
97
Which of the following can be made into crystal?
[A]
A virus
[B]
A sperm
[C]
A bacterium
[D]
An Amoeba
98
Who discovered the first living cell?
[A]
Leeuwenhoek
[B]
Purkinje
[C]
Robert Hooke
[D]
None
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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