Class 9 Science Student Questions

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Showing: Class 9 / Science (314 questions)

by GIANSH GUPTA KHUNDKER · Class 9

Which type of electromagnetic wave has a wavelength shorter than visible light but longer than X-rays, and is commonly used for sterilizing medical equipment?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

Two resistors, one with a resistance of 3.0 Ω and another with a resistance of 6.0 Ω, are connected in parallel across a 12 V battery. What is the total current drawn from the battery by this parallel combination?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

A student stands 165 meters away from a tall vertical wall and claps their hands loudly. If the speed of sound in air is 330 m/s, how much time elapses between the clap and the student hearing the echo?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

A uniform meter rule is balanced horizontally at its midpoint pivot (the 50 cm mark). A 4.0 N weight is suspended from the 20 cm mark. What force must be applied downward at the 90 cm mark to maintain horizontal equilibrium?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

An astronaut transports a rock sample with a mass of 3.0 kg from Earth to the Moon. The gravitational field strength on Earth is 10 N/kg, and on the Moon, it is 1.6 N/kg. What are the mass and weight of the rock on the Moon?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

Which subatomic particle carries a negative charge and orbits the nucleus?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

Which separation method is most suitable for recovering pure water from a salt water solution?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

What type of energy conversion takes place when you rub your hands together?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

According to the law of reflection, the angle of incidence is always equal to:

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

Why is aluminum metal unreactive with air under normal conditions?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

Which plant tissue is responsible for transporting water and dissolved minerals from the roots to the rest of the plant?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

Which of the following statements about the unit of pressure is correct?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

When a dark grey solid iodine is heated, it changes directly into a purple gas without melting. Which term describes this phase change?

Science Other 0 1 answers 100%
by GIANSH GUPTA KHUNDKER · Class 9

Which of the following is the best definition of a gene?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

What is growth?

Science Diversity in Living Organisms 0 0 answers 0%
by AARON DUTTA · Class 9

Which of the following substances is a pure element?

Science Atoms and Molecules 0 2 answers 100%
by AARON DUTTA · Class 9

What is the main cause of evaporation?

Science Atoms and Molecules 0 1 answers 100%
by AARON DUTTA · Class 9

Which of the following changes is reversible?

Science Atoms and Molecules 0 2 answers 100%
by AARON DUTTA · Class 9

Which of the following processes involves the change of gas into a liquid?

Science Atoms and Molecules 0 1 answers 100%
by AARON DUTTA · Class 9

What is sublimation?

Science Atoms and Molecules 0 2 answers 100%

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