# Question Bank Solutions for SSC (Marathi Semi-English) 9th Standard [इयत्ता ९ वी] - Maharashtra State Board - Science and Technology

Subjects
Topics
Subjects
Popular subjects
Topics
Science and Technology
< prev 1 to 20 of 407 next >

Complete the following table.

 u (m/s) a (m/s2) t (sec) v = u + at (m/s) 2 4 3 - - 5 2 20
 u (m/s) a (m/s2) t (sec) s = ut + 1/2at2 (m) 5 12 3 - 7 - 4 92
 u (m/s) a(m/s2) s (m) v2 = u2 + 2 as (m/s)2 4 3 - 8 - 5 8.4 10
[0.01] Laws of Motion
Chapter: [0.01] Laws of Motion
Concept: Motion and Rest

Give scientific reason.
Even though the magnitudes of action force and reaction force are equal and their directions are opposite, their effects do not get cancelled.

[0.01] Laws of Motion
Chapter: [0.01] Laws of Motion
Concept: Motion and Rest

Determine the amount of work done when an object is displaced at an angle of 30^circ with respect to the direction of the applied force.

[0.02] Work and Energy
Chapter: [0.02] Work and Energy
Concept: Definition of Work

Why is the work done on an object moving with uniform circular motion zero?

[0.02] Work and Energy
Chapter: [0.02] Work and Energy
Concept: Definition of Work

Solve the following example.
An electric pump has 2 kW power. How much water will the pump lift every minute to a height of 10 m?

[0.02] Work and Energy
Chapter: [0.02] Work and Energy
Concept: Definition of Work

Solve the following example.
If a 1200 W electric iron is used daily for 30 minutes, how much total electricity is consumed in the month of April?

[0.02] Work and Energy
Chapter: [0.02] Work and Energy
Concept: Definition of Work

Solve the following example.
The velocity of a car increase from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?

[0.02] Work and Energy
Chapter: [0.02] Work and Energy
Concept: Definition of Work

Solve the following example.
Ravi applied a force of  10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?

[0.02] Work and Energy
Chapter: [0.02] Work and Energy
Concept: Definition of Work

Choose one or more correct alternatives.
For work to be performed, energy must be ________

(i) transferred from one place to another
(ii) concentrated
(iii) transformed from one type to another
(iv) destroyed

[0.02] Work and Energy
Chapter: [0.02] Work and Energy
Concept: Definition of Work

Choose one or more correct alternatives.
Joule is the unit of ________
(i) force
(ii) work
(iii) power
(iv) energy

[0.02] Work and Energy
Chapter: [0.02] Work and Energy
Concept: Definition of Work

Rewrite the following sentence using proper alternative.
The work done on an object does not depend on _______

[0.02] Work and Energy
Chapter: [0.02] Work and Energy
Concept: Definition of Work

The following table shows current in Amperes and potential difference in Volts.
What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)

[0.03] Current Electricity
Chapter: [0.03] Current Electricity
Concept: Electric Potential and Potential Difference

The following table shows current in Amperes and potential difference in Volts.
Which law will the graph prove? Explain the law.

[0.03] Current Electricity
Chapter: [0.03] Current Electricity
Concept: Electric Potential and Potential Difference

Explain how the element sodium is monovalent.

[0.04] Measurement of Matter
Chapter: [0.04] Measurement of Matter
Concept: Laws of Chemical Combination

Write down the changes that will be seen in the instance and explain the reason behind it.

Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH.

[0.05] Acids, Bases and Salts
Chapter: [0.05] Acids, Bases and Salts
Concept: Ionic Compounds : Recapitulation

Correct and rewrite the following statement and justify your correction.

Carnivores occupy the second trophic level in the food chain.

[0.07] Energy Flow in an Ecosystem
Chapter: [0.07] Energy Flow in an Ecosystem
Concept: Energy Flow in an Ecosystem

Correct and rewrite the following statement and justify your correction.

The flow of nutrients in an ecosystem is considered to be a ‘one way’ transport.

[0.07] Energy Flow in an Ecosystem
Chapter: [0.07] Energy Flow in an Ecosystem
Concept: Energy Flow in an Ecosystem

Correct and rewrite the following statement and justify your correction.

Plants in an ecosystem are called primary consumers.

[0.07] Energy Flow in an Ecosystem
Chapter: [0.07] Energy Flow in an Ecosystem
Concept: Energy Flow in an Ecosystem

Give reason.

Flow of nutrients through an ecosystem is cyclic.

[0.07] Energy Flow in an Ecosystem
Chapter: [0.07] Energy Flow in an Ecosystem
Concept: Energy Flow in an Ecosystem

Give reason .

Energy flow through an ecosystem is ‘one way’.

[0.07] Energy Flow in an Ecosystem
Chapter: [0.07] Energy Flow in an Ecosystem
Concept: Energy Flow in an Ecosystem
< prev 1 to 20 of 407 next >