SSC (Marathi Semi-English) ९ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Science and Technology

Write the chemical formula.

Baking soda

Fill in the blank and explain.

The velocity of sound in steel is ______ than the velocity of sound in water.

The incidence of ______ in daily life shows that the velocity of sound is less than the velocity of light.

The speed of sound in air at 0°C is 332 m/s. If it increases at the rate of 0.6 m/s per degree, what will be the temperature when the velocity has increased to 344 m/s?

Nita heard the sound of lightning after 4 seconds of seeing it. What was the distance of the lightning from her?

(The velocity of sound in air is 340 m/s.)

Sunil is standing between two walls. The wall closest to him is at a distance of 660 m. If he shouts, he hears the first echo after 4 s and another after another 2 seconds.

1. What is the velocity of sound in air?
2. What is the distance between the two walls? 

Hydrogen gas is filled in two identical bottles, A and B, at the same temperature. The mass of hydrogen in the two bottles is 12 gm and 48 gm respectively. In which bottle will sound travel faster? How many times be as fast as the other?

Helium gas is filled in two identical bottles A and B. The mass of the gas in the two bottles is 10 gm and 40 gm respectively. If the speed of sound is the same in both bottles, what conclusions will you draw?

Write the uses of diamond.

Write two physical properties.

Diamond

Which type of mirror is used in the following?

Periscope

Write the name of microbes found in the following food material.

Bread

Write the name of microbes found in the following food material.

Root nodules of leguminous plants

Write the name of microbes found in the following food material.

idli

Write the name of microbes found in the following food material.

Dosa

Write the name of microbes found in the following food material.

Spoiled potato curry

Which type of mirror is used in the following?

Kaleidoscope

Clarify the difference.

Uniform and non-uniform motion.

Give scientific reasons.

The velocity of an object at rest is considered to be uniform.

Explain the need for a reference atom for atomic mass. Give some information about two reference atoms.