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Physics Test - ...

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  • Question 1
    1 / -0

    A current of i amp flows in the loop having circular arc r metre, subtending an angle as shown in the figure. The magnetic field at centre O of circle is :

  • Question 2
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    A coin is placed on a horizontal platform, which undergoes vertical simple harmonic motion of angular frequency ω. The amplitude of oscillation is gradually increased. The coil will leave contact with the platform for the first time.

  • Question 3
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    Time taken by sunlight to pass through a window of thickness 4 mm with refractive index 3/2, is :

  • Question 4
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    A horizontal force \(F\) is applied such that the block remains stationary because \(N\) will produce torque. The torque produced by friction force is equal and opposite the torque produce due to normal reaction (N).

  • Question 5
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    The logic gate represented in following figure is:

  • Question 6
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    In the following common emitter circuit, if β = 100, VCE = 7V, VBE = Negligible and RC = 2 kΩ, then IB is equal to :

  • Question 7
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    A circular disc of radius R is removed from a bigger circular disc of radius 2R as shown in the figure. The centre of mass of the new disc is αR from the centre of the bigger disc. What is the value of α?

  • Question 8
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    A copper bar of length 1 m and cross-sectional area 10 × 10-2 m2 has its one end maintained at 100oC by means of 0.4 kW electric heater. What is the temperature of the other end in steady state, given that the thermal conductivity of copper is 400 W/mK?

  • Question 9
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    Number of particles passing in unit time through unit area perpendicular to z-axis is given by N= D (N2 - N1)/(Z2 - Z1) , where N2 and N1 are number of particles in unit volume at Z2 and Z1. The dimensional formula of D is

  • Question 10
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    The equation of a wave is \(y=5 \sin \left(\frac{t}{0.04}-\frac{x}{4}\right),\) where \(x\) is in \(cm\) and \(t\) in seconds. The maximum velocity of the particle will be :

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