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Oswaal mcq Class 12. We covered all the Oswaal mcq Class 12 in this post for free so that you can practice well for the exam.
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Oswaal Objective mcq Class 12 for Students
What is the size range of Respirable Suspended Particulate Matter (RSPM) present in air?
A) Greater than 7 μm
B) Greater than 6 μm
C) Greater than 5 μm
D) Less than 5 μm
Option d – Less than 5 μm
Four wires made of the same material are stretched separately by equal loads. Which wire will show the greatest extension?
A) A wire of 1 m length and 2 mm diameter
B) A wire of 2 m length and 2 mm diameter
C) A wire of 3 m length and 1.5 mm diameter
D) A wire of 1 m length and 1 mm diameter
Option c – A wire of 3 m length and 1.5 mm diameter
In which of the following cases is capillary action not the sole factor involved?
A) Absorption of ink by blotting paper
B) Rise of groundwater through soil
C) Spreading of a water drop on cotton fabric
D) Transport of water from plant roots to leaves
Option d – Transport of water from plant roots to leaves
Kerosene floats on the surface of water because
A) Its density is higher than that of water
B) Its density is lower than that of water
C) Its density is equal to that of water
D) None of the above
Option b – Its density is lower than that of water
The pressure inside a soap bubble is
A) Greater than atmospheric pressure
B) Less than atmospheric pressure
C) Equal to atmospheric pressure
D) Half of atmospheric pressure
Option a – Greater than atmospheric pressure
When two soap bubbles of unequal sizes are connected by a tube, what happens?
A) Both bubbles remain unchanged in size
B) The smaller bubble shrinks while the larger bubble grows
C) The smaller bubble grows and the larger bubble shrinks until both are equal
D) Both bubbles burst immediately
Option b – The smaller bubble shrinks while the larger bubble grows
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