Science Quiz for Class 9
- Question of
The chemical symbol for sodium is ______.
- Na
- NA
- Sd
- So
- Question of
3.42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are ________.
- 6. 68 × 10
- 6. 09 × 10
- 6. 022 × 10
- 6. 22 × 10
- Question of
A change in the physical state can be brought about ________.
- when energy is either given to, or taken out from the system
- only when energy is taken out from the system
- only when energy is given to the system
- without any energy change
- Question of
Percentage of calcium in calcium carbonate is ________.
- 40
- 30
- 48
- 36
- Question of
The molecule having an atomicity of 4 is:
- Phosphorus molecule
- Sulphate molecule
- Ozone molecule
- Methane molecule
- Question of
Which of the following can be made into crystal?
- A virus
- An Amoeba
- A bacterium
- A sperm
- Question of
A cell will swell up if:
- the concentration of water molecules in the surrounding medium is higher than water molecules concentration in the cell.
- the concentration of water molecules in the cell is higher than the concentration of water molecules in the surrounding medium.
- the concentration of water molecules is same in the cell and in the surrounding medium.
- concentration of water molecules does not matter.
- Question of
Chromosomes are made up of ________.
- DNA and protein
- RNA
- Protein
- DNA
- Question of
Which of these is not related to endoplasmic reticulum?
- It can be the site of energy generation.
- It behaves as a transport channel for proteins between nucleus and cytoplasm.
- It transports materials between various regions in the cytoplasm.
- It can be the site for some biochemical activities of the cell.
- Question of
Following are a few definitions of osmosis:
- Movement of water molecules from a region of higher concentration to a region of lower concentration through a semi-permeable membrane.
- Movement of solvent molecules from its higher concentration to lower concentration.
- Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane.
- Movement of solute molecules from lower concentration to higher concentration of solution through a semi permeable membrane.
- Question of
Plasmolysis in a plant cell is defined as ________,
- shrinkage of cytoplasm in hypertonic medium
- breakdown (lysis) of plasma membrane in hypotonic medium
- shrinkage of nucleoplasm
- none of them
- Question of
Which of the following are covered by a single membrane?
- Vacuole
- Lysosome
- Mitochondria
- Plastid
- Question of
Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell?
- Smooth endoplasmic reticulum
- Golgi apparatus
- Lysosomes
- Vacuoles
- Question of
The proteins and lipids, essential for building the cell membrane, are manufactured by ________.
- rough endoplasmic reticulum
- golgi apparatus
- plasma membrane
- mitochondria
- Question of
Which out of the following is not a function of vacuole?
- Locomotion
- Providing turgidity and rigidity to the cell
- Storage
- Waste excretion
- Question of
Which of the following correctly represents the electronic distribution in the Mg atom?
- 2, 8, 2
- 3, 8, 1
- 1, 8, 3
- 8, 2, 2
- Question of
Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of:
- nucleus in the atom
- electron
- proton
- atomic mass
- Question of
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
- 10
- 13
- 14
- 16
- Question of
Which of the following statement is always correct?
- An atom has equal number of electrons and protons.
- An atom has equal number of electrons, protons and neutrons.
- An atom has equal number of electrons and neutrons.
- An atom has equal number of protons and neutrons.
- Question of
An alpha particle is also known as:
- a doubly-charged helium ion
- an unionized helium atom
- subatomic particle
- a neutral particle
- Question of
When a body falls freely towards the earth, then its total energy ________.
- remains constant
- decreases
- increases
- first increases and then decreases
- Question of
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car:
- does not change
- becomes twice to that of initial
- becomes 4 times that of initial
- becomes 16 times that of initial
- Question of
Which one of the following is not the unit of energy?
- kilowatt
- kilowatt hour
- joule
- newton metre
- Question of
The work done on an object does not depend upon the:
- initial velocity of the object
- angle between force and displacement
- force applied
- displacement
- Question of
Work done by friction:
- decreases kinetic energy of body
- increases kinetic energy of body
- increases potential energy of body
- decreases potential energy of body.
- Question of
During summer, water kept in an earthen pot becomes cool because of the phenomenon of:
- evaporation
- osmosis
- transpiration
- diffusion
- Question of
Choose the correct statement from the following:
- Conversion of vapour into solid without passing through the liquid state is called sublimation
- Conversion of solid into vapour without passing through the liquid state is called vaporization.
- Conversion of vapour into solid without passing through the liquid state is called freezing.
- Conversion of solid into liquid is called sublimation.
- Question of
Which condition out of the following will increase the evaporation of water?
- Increase in temperature of water
- Decrease in temperature of water
- Less exposed surface area of water
- Adding common salt to water
- Question of
The boiling point of water at sea level is ________.
- 373 K
- 273 K
- 0°C
- 273°C
- Question of
Which of the following conditions is most favorable for converting a gas into a liquid?
- High pressure, low temperature
- Low pressure, low temperature
- Low pressure, high temperature
- High pressure, high temperature