# A beaker containing a liquid is kept inside a big closed jar. If the air inside the jar is continuously pumped out, the pressure in the liquid near the bottom of the liquid will: 1. increase 2. decrease 3. remain constant 4. first decrease and then increase

Subtopic:  Pressure |
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The pressure in a liquid at two points in the same horizontal plane are equal. Consider an elevator accelerating upward and a car accelerating on a horizontal road. The above statement is correct in

1. the car only

2. the elevator only

3. both of them

4. neither of them

Subtopic:  Pressure |
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Suppose the pressure at the surface of mercury in a barometer tube is P1 and the pressure at the surface of mercury in the cup is P2.

1. P1 = 0, P2 = atmospheric pressure

2. P1 = atmospheric pressure, P2 = 0

3. P1 = P2 = atmospheric pressure

4. P1 = P2 = 0

Subtopic:  Pressure |
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A barometer kept in an elevator reads 76 cm when it is at rest. If the elevator goes up with increasing speed, the reading will be

1. zero

2. 76 cm

3. < 76 cm

4. > 76 cm

Subtopic:  Pressure |
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A barometer kept in an elevator accelerating upward reads 76 cm. The air pressure in the elevator is

1. zero

2. 76 cm

3. < 76 cm

4. > 76 cm

Subtopic:  Pressure |
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To construct a barometer, a tube of length 1 m is filled completely with mercury and is inverted in a mercury cup. The barometer reading on a particular day is 76 cm. Suppose a 1 m tube is filled with mercury up to 76 cm and then closed by a cork. It is inverted in a mercury cup and the cork is removed. The height of mercury column in the tube over the surface in the cup will be

1. zero

2. 76 cm

3. > 76 cm

4. < 76 cm

Subtopic:  Pressure |
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A $$20$$ N metal block is suspended by a spring balance. A beaker containing some water is placed on a weighing machine which reads $$40$$ N. The spring balance is now lowered so that the block gets immersed in the water. The spring balance now reads $$16$$ N. The reading of the weighing machine will be:
1. $$36$$ N
2. $$60$$ N
3. $$44$$ N
4. $$56$$ N

Subtopic:  Archimedes' Principle |
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A piece of wood is floating in water kept in a bottle. The bottle is connected to an air pump. Neglect the compressibility of water. When more air is pushed into the bottle from the pump, the piece of wood will float with

1. larger part in the water

2. lesser part in the water

3. same part in the water

4. it will sink

Subtopic:  Pressure |
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A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water, the force on the bottom of the vessel in contact with the cube:
1. will increase
2. will decrease
3. will remain the same
4. will become zero

Subtopic:  Archimedes' Principle |
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A wooden object floats in water kept in a beaker. The object is near a side of the beaker (figure). Let $$P_1,$$ $$P_2,$$ $$P_3$$ be the pressures at the three points A, B and C of the bottom as shown in the figure.

Then:
1. $$P_1=P_2=P_3$$
2. $$P_1<P_2<P_3$$
3. $$P_1=P_2\neq P_3$$
4. $$P_2=P_3\neq P_1$$

Subtopic:  Pressure |
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