CBSE Class 9 Physics Fill In The Blanks

CBSE Class 9 Physics Fill In The Blanks for Force and Laws of Motion.

1.     force

2.     Inertia

3.     backwards, forwards

4.     third

5.     Momentum

6.     momentum

7.     third

8.     momentum, force

9.     friction

10. same

CBSE Class 9 Physics Fill In The Blanks for Gravitation.

1.     pressure

2.     masses, distance

3.     weight

4.     The ratio of buoyant forces experienced by a solid body when immersed in two liquids whose relative densities are 1 and 0.5 respectively is 2:1.

5.     mass

6.     volume, density

7.     sinks, floats

8.     buoyant

9.     When a body is partially or completely immersed in a fluid at est, experiences an upthrust which is equal to the weight of the fluid displaced by it

10. decreases

CBSE Class 9 Physics Fill In The Blanks for Work and Energy.

1.     Gravitational potential energy is due to the force of attraction between the earth and the object.

2.     Power is the rate at which work is done or energy is consumed

3.     According to the law of conservation of energy, the total energy of the universe remains constant

4.     Hence, if velocity is tripled, the KE becomes nine times.

5.     Energy due the motion is called kinetic energy.

6.     straight v equals 10 space straight m divided by straight s

Straight K. straight E. equals 100 space straight J

Straight m equals?

Straight K. straight E. equals 1 half mv squared

straight m equals fraction numerator straight K. straight E. cross times 2 over denominator straight v squaredend fraction

straight m equals fraction numerator 100 cross times 2 over denominator left parenthesis 10 right parenthesis squared end fraction

straight m equals 2 space kg

7.     given:

m=10 kg

v=10 m/s

Work done will be negative of the energy contained in the body,

8.     The amount of energy possessed by a body is equal to the total quantity of work it can do.

CBSE Class 9 Physics Fill In The Blanks for Sound.

1.     ultrasonic

2.     reverberation

3.     20, 20

4.     Wavelength

5.     Sound is a mechanical wave and it travels through any material medium.

6.     vacuum

7.     longitudinal

8.     130 cm.

The distance between 1st crest and 7th crest is equal to six wavelengths. The distance between 7th crest and 7th trough is equal to half wavelength. Thus, the total distance between 1st crest and 7th trough of a transverse wave of wavelength 20 cm is

9.     propagation

10. echo

CBSE Class 9 Chemistry Fill In The Blanks for Atoms and Molecules.

1.     One nm is equal to 10^-9 m.

2.     According to Law of conservation of mass, mass in closed system will remain constant.

3.     The valency of hydrogen in Ammonia (NH³) is 1.

4.     The number of atoms in a molecule is called its atomicity.

5.     The anion of an element has more electrons than the normal atom.

6.     The number of atoms of each element in a given compound is fixed.

7.     The valency of bromide ion is -1

8.     Indivisibility of atom was proposed by Dalton.

9.     The number of atoms present in 12g of C-12 isotope i.e.,6.023×10²³atoms is Avogadro's number.

10. Hydrogen molecule exists as H².

CBSE Class 9 Chemistry Fill In The Blanks for Structure of the Atom

1.     The mass of proton is equal to that of another subatomic particle present in an atom called neutron

2.     Valence electrons are located in the outermost shell of an atom.

3.     A systematic distribution of electron in various energy level of an atom of an element is known as its electronic configuration

4.     Most of the α-particles pass straight through the gold foil showing that most of the space in the atom is empty

5.     An  α-particle consists of doubly - charged helium ions.

6.     An atom contains positively charged particles at the center.

7.     Canal rays are attracted towards negative electrode

8.     The nucleus in an atom is dense, small in size and is positively charged

9.     Nucleus of an atom is positively charged

10. According to Bohr's model of an atom while revolving in discrete orbits, the electrons do not radiate energy.

CBSE Class 9 Biology Fill In The Blanks for Diversity in Living Organisms.

1.     Single

2.     Annelida

3.     Vertebral column

4.     Amphibia

5.     Triploid

6.     Cnidaria

7.     Lichen

8.     Bryophytes

9.     Aves

10. Echinoderm

CBSE Class 9 Biology Fill In The Blanks for Why Do We Fall Ill?.

1.     Disease

2.     Intrinsic

3.     Infection

4.     Symptoms

5.     Viral

6.     dancer

7.     Microorganisms

8.     Hepatitis

9.     Pathogens

10.    Bacteria

CBSE Class 9 Biology Fill In The Blanks for Natural Resources.

1.     Denitrification

2.     Nitrate

3.     Soil

4.     BOD

5.     Carbon dioxide

6.     Nitrobacter

7.     Detritovores

8.     Nitrogen

9.     Combined water

10. Fluorine

CBSE Class 9 Biology Fill In The Blanks for Improvement in Food Resources.

1.     Fungal

2.     Interspecific

3.     Crop rotation

4.     Culture fishery

5.     Fowl

6.     Earthworms

7.     Viral

8.     Manures

9.     Solid

10.   Rice