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WBJEE 2019 Revision Test 5

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Question 1

When a battery connected across a resistor of 16

, voltage across the resistor is 12V. When the same battery is connected across a resistor of 10

, voltage across it is 11V. The internal resistance of the battery (in ohms) is

Question 2

Which of the following particle will describe the smallest circle when projected with same velocity perpendicular to magnetic field?

Question 3

One mole of ideal gas undergoes a linear process as shown in figure below. Its temperature expressed as a function of volume V is,

Question 4

In a transverse wave the distance between a crest and neighboring trough at the same instant is 4.0 cm and the distance between a crest and trough at the same place is 1.0 cm. The next crest appears at the same place after a time interval of 0.4s. The maximum speed of the vibrating particles in the medium is :

Question 5

A radioactive nucleus undergoes a series of decays:

This sequence of decay is

Question 6

Which gas is evolved when lithium carbonate is heated?

Question 7

Occlusion is a process which involves:

Question 8

Which is the most acidic here?

Question 9

Which one of the following is least acidic?

Question 10

For the air/water system at 298.15 K (25 °C) and atmospheric pressure mole fraction of water vapor (species 1) in air is 0.031. If henry’s constant of air is 72950 bar; Find the mole fraction of air (species 2).

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