# The equivalent resistance of the infinite network given below is:                   1.  $$2~\Omega$$ 2.  $$(1+\sqrt2)~\Omega$$ 3.  $$(1+\sqrt3)~\Omega$$ 4.  $$(1+\sqrt5)~\Omega$$

Subtopic:  Combination of Resistors |
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A cricket ball is thrown by a player at a speed of 20 m/s in a direction 30° above the horizontal. The maximum height attained by the ball during its motion is: (g = 10 m/s2)
1.  5 m
2.  10 m
3.  20 m
4.  25 m
Subtopic:  Projectile Motion |
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A closely packed coil having 1000 turns has an average radius of 62.8 cm. If current carried by the wire of the coil is 1 A, the value of magnetic field produced at the centre of the coil will be:
(permeability of free space = 4$$\pi$$ × 10-7 H/m) nearly:
1.  10-1 T
2.  10-2 T
3.  102 T
4.  10-3 T
Subtopic:  Magnetic Field due to various cases |
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An inductor of inductance 2 mH is connected to a 220 V, 50 Hz ac source. Let the inductive reactance in the circuit is X1. If a 220 V dc source replaces the ac source in the circuit, then the inductive reactance in the circuit is X2. X1 and X2 , respectively, are:
1.  6.28 $$\Omega$$, zero
2.  6.28 $$\Omega$$, infinity
3.  0.628 $$\Omega$$, zero
4.  0.628 $$\Omega$$, infinity
Subtopic:  Different Types of AC Circuits |
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During a cloudy day, a primary and a secondary rainbow may be created. Which of the following statement is correct?
 1 primary rainbow is due to double internal reflection and is formed above the secondary one. 2 primary rainbow is due to double internal reflection and is formed below the secondary one. 3 secondary rainbow is due to double internal reflection and is formed above the primary one. 4 secondary rainbow is due to a single internal reflection and is formed above the primary one.
Subtopic:  Total Internal Reflection |
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The light rays having photons of energy 4.2 eV are falling on a metal surface having a work function of 2.2 eV. The stopping potential of the surface is:
1.  2 eV
2.  2 V
3.  1.1 V
4.  6.4 V
Subtopic:  Einstein's Photoelectric Equation |
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In the diagram shown, the normal reaction force between 2 kg and 1 kg is (Consider the surface to be smooth):
Given g = 10 ms-2

1.  25 N
2.  39 N
3.  6 N
4.  10 N
Subtopic:  Tension & Normal Reaction |
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Identify the equivalent logic gate represented by the circuit given above:

1. OR
2. NOR
3. AND
4. NAND
Subtopic:  Logic gates |
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Two copper vessels A and B have the same base area but are of different shapes. A takes twice the volume of water as that B requires to fill upto a particular common height. Then the correct statement among the following is:
1.  Pressure on the base area of vessels A and B is same.
2.  Pressure on the base area of vessels A and B is not same.
3.  Both vessels A and B weigh the same.
4.  Vessel B weighs twice that of A.
Subtopic:  Pressure |
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The distance between the two plates of a parallel plate capacitor is doubled and the area of each plate is halved. If C is its initial capacitance, its final capacitance is equal to:
1.  2C
2.  C/2
3.  4C
4.  C/4
Subtopic:  Capacitance |
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