Question Of The Day(AIEEE)

A particle moves along the xaxis as x = u(t-1)2 + a(t-3)3

[a] initial velocity of the particle is u

[b] the acceleration of the particle is a

[c] the acceleration of the particle is 2a

[d] the particle is at the origin at time t=3 seconds

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Question Of The Day(CET)

A straight wire of diameter 0.5mm carrying a current of 1A is replaced by another wire of radius 1mm diameter and carrying the same current. The strength of the magnetic field far away is

[a] twice the earlier value

[b] one half of the earlier value

[c] one quarter of the earlier value

[d] same as the earlier value

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Question Of The Day(AIEEE)

Find the angle of minimum deviation for an equilateral prism made of a material of refractive index 1.732. What is the angle of incidence for this deviation ?

a)60
b)0
c)30
d)90

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Question Of The Day(CET)

If the resistivity of potentiometer wire be ρ and area of cross section be A, then what will be the potential gradient along the wire?

[a] Iρ/A [b]I/ρA

[c] IA/ρ [d] Iaρ

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Question Of The Day

IN NPN transistor, the collector current is 24mA. If 80% of the electrons reach collector, the base current in mA is

             [a] 36                                       [b] 26

             [c] 16                                       [d]6

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Question Of The Day

Within depletion region of the pn junction diode

             [a] p side is positive and n side is negative

             [b] p side is negative and n side is +ive

             [c] both sides are either positive or negative

             [d] both sides are neutral

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Question Of The Day

Two batteries of different emfs are connected in series with each other and with external load resistance. The current is 3A. when the polarity of one of the batteries is reversed the current is 1A. the ratio of emf’s of the two batteries is

        [a] 2.5                     [b] 2

        [c] 1.5                     [d] 1

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Question Of The Day

The magnitude of earth’s magnetic field at the North pole is B_0­. a horizontal conductor of length l moves with velocity v. the direction of v is perpendicular to the conductor. The induced emf is

        [a] zero, if v is vertical          [b] B₀lv, if v is vertical

        [c] zero, if v is horizontal       [d]B₀lv is v is horizontal

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Question Of The Day,

A vertical conducting ring of radius R falls vertically in a horizontal magnetic field of magnitude B. the direction of B is perpendicular to the plane of the ring. When the speed of the ring is v,  

        [a] no current flows in the ring

        [b] A and D are at the same potential.

        [c] C and E are at the same potential

        [d] the potential difference between A and D is 2Brv, with D at higher potential.

   

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Question of the day

The length of a simple pendulum executing simple harmonic motion is increased by 21%. The percentage increase in the time period of the pendulum of increased length is

            (A) 11%                                                           (B) 21%

            (C) 42%                                                           (D) 10%

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Question of the day

    A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°. The torque needed to maintain the needle in this position will be

            (A) Ö3 W                                                          (B) W

            (C) (Ö3/2) W                                                    (D) 2W

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Question of the day

.       A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is             (A) 20 N                                                          (B) 50 N             (C) 100 N                                                        (D) 2 N

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Question of the Day

The capacitance of two oppositely charged metal spheres of same radius when far apart will be equal to

        [a]2C                       [b]C/2

        [c]C/4                      [d]4C

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Question Of The Day

The masses of the three wires are in the ratio 1:3:5 and their lengths are in the ratio 5:3:1. then the ratio of their electrical resistance is

        [a] 1:3:5                  [b] 5:3:1

        [c]1:15:125              [d]125:15:1

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Question of the day

Focal length for Concave mirror
a)positive
b)negative
c)infinity
d)cannot be predicted


This is the simple question for today.Although its looking like a simple question there is lot of confusion in the students about this question.Lets discuss this first.

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