The value of g at a place decreases by 2%. Then, the barometric height of mercury:

1. increases by 2%. 2. decreases by 2%.
3. remains unchanged. 4. sometimes increases and sometimes decreases.

Subtopic:  Pressure |
 67%
From NCERT
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A barometer kept in a stationary elevator reads 76 cm. If the elevator starts accelerating up, the reading will be:

1. zero. 2. equal to 76 cm.
3. more than 76 cm. 4. less than 76 cm.
Subtopic:  Pressure |
 63%
From NCERT
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 A body is just floating on the surface of a liquid. The density of the body is the same as that of the liquid. The body is slightly pushed down. What will happen to the body?

1. It will slowly come back to its earlier position
2. It will remain submerged, where it was left
3. It will sink
4. It will come out violently

Subtopic:  Archimedes' Principle |
 56%
From NCERT
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If two pieces of metal when immersed in a liquid have equal upthrust on them, then:

1. Both pieces must have equal weights
2. Both pieces must have equal densities
3. Both pieces must have equal volumes
4. Both are floating in the same depth

Subtopic:  Archimedes' Principle |
 56%
From NCERT
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The following fig. shows the flow of liquid through a horizontal pipe. Three tubes A, B and C are connected to the pipe. The radii of the tubes A, B and C at the junction are respectively 2 cm, 1 cm and 2 cm. It can be said that the:

          

1. Height of the liquid in the tube A is maximum
2. Height of the liquid in the tubes A and B is the same
3. Height of the liquid in all the three tubes is the same
4. Height of the liquid in the tubes A and C is the same

Subtopic:  Bernoulli's Theorem |
 75%
From NCERT
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There is a hole in the bottom of a tank having water. If the total pressure at the bottom is 3 atm (1 atm=105 N/m2), then the velocity of water flowing from the hole is:

1. \(\sqrt{400}~~\text{m/s}\) 2. \(\sqrt{600}~~\text{m/s}\)
3. \(\sqrt{60}~~\text{m/s}\) 4. None of these

Subtopic:  Bernoulli's Theorem |
 63%
From NCERT
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A square plate of 0.1 m side moves parallel to a second plate with a velocity of 0.1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 poise, then the distance between the plates in m is:

1. 0.1 2. 0.05
3. 0.005 4. 0.0005
Subtopic:  Viscosity |
From NCERT
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A spherical ball of radius \(r\) is falling in a viscous fluid of viscosity \(\eta\) with a velocity \(v.\) The retarding viscous force acting on the spherical ball is:

1. inversely proportional to \(r\) but directly proportional to velocity \(v.\)
2. directly proportional to both radius \(r\) and velocity \(v.\)
3. inversely proportional to both radius \(r\) and velocity \(v.\)
4. directly proportional to \(r\) but inversely proportional to \(v.\)

Subtopic:  Viscosity |
 87%
From NCERT
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The pans of a physical balance are in equilibrium. If Air is blown under the right hand pan then the right hand pan will:

1. Move up 2. Move down
3. Move erratically 4. Remain at the same level
 

Subtopic:  Bernoulli's Theorem |
 61%
From NCERT
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A sniper fires a rifle bullet into a gasoline tank making a hole 53.0 m below the surface of gasoline. The tank was sealed at 3.10 atm. The stored gasoline has a density of 660 kgm-3. The velocity with which gasoline begins to shoot out of the hole will be:
 

1. 27.8 ms-1 2. 41.0 ms-1
3. 9.6 ms-1 4. 19.7 ms-1
Subtopic:  Bernoulli's Theorem |
 54%
From NCERT
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