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Science
9th
grade
Thrust and Pressure | Gravitation | Assessment | English | Grade 9
6 questions
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- 1. Multiple Choice
What is the SI unit of density and relative density?
Both have the same unit, Kilogram per metre cube
Density-Kilogram per metre cube Relative Density-no unit
Density-Kilogram per metre cube Relative Density-Kilogram per metre
None of these
- 2. Multiple Choice
A block of brick was placed on a table, what is the pressure exerted by the brick?
Weight of the brick per unit area
Mass of the brick per unit area
Weight of the brick per unit surface area
Mass of the brick per unit surface area
- 3. Multiple Choice
A iron rod of mass 5 kg and a rubber ball of mass 0.5 kg fell into the water and displaced 1 liter of water each. What is the amount of buoyant force exerted on both the bodies?
Buoyant force (Iron rod)= 49 N Buoyant force (rubber ball)= 4.9 N
Buoyant force (Iron rod)= 48 N Buoyant force (rubber ball)= 3.9 N
Buoyant force (Iron rod)= 9.8 N Buoyant force (rubber ball)= 9.8 N
Buoyant force (Iron rod)= 1 N Buoyant force (rubber ball)= 1 N
- 4. Multiple Choice
In a birthday party, 5 kg biriyani was placed in a dish of dimension 5m × 5m × 5m and mass 5kg. After the party only 20⁒ of the biryani was left due to which it was shifted to a dish whose dimensions and mass were reduced by 60⁒.Calculate the pressure exerted by the dish before and after the party?
4 Pa and 5 Pa
2 Pa and 7.5 Pa
4 Pa and 7.5 Pa
2 Pa and 5 Pa
- 5. Multiple Choice
A wooden cubical box of mass 2 kg with dimensions of 40 cm × 10 cm × 20 cm was placed on the floor. What will the minimum and maximum pressure exerted by the box?
Minimum = 245 N/m² Maximum= 980 N/ m²
Minimum = 245 N/m² Maximum= 490 N/ m²
Minimum = 490 N/m² Maximum= 980 N/ m²
Equal pressure is exerted at all times.
- 6. Multiple Choice
An man of mass 50 kg on earth. He went to moon and exerted a pressure twice to that in earth. What is the pressure exerted on the moon. Assume area is same in both the cases.
25 Pa
40 Pa
245 Pa
None of these
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