AIEEE Physics Test 3 [Test]

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AIEEE Physics Test 3

Correct	Answer Text
	$\infty$
	$2\pi \sqrt {\frac {R_e}{g}}$
	$2\pi \sqrt {\frac {3R_e}{g}}$
	$2\pi \sqrt {\frac {2R_e}{g}}$

Correct	Answer Text
	0
	$\frac {2}{3}g$
	$\frac {g}{2}$
	g

A toy-cart is tied to one end of an unstretched string of length x. When revolved, the toy-cart moves in a horizontal circle of radius 2x with a time period T. When the speed of the toy-cart is so increased that it moves in a horizontal circle of radius 3x, its time period is T'. the value of T' is

Answers

Correct	Answer Text
	T
	$\frac {T}{4}$
	$\frac {T}{2}$
	$\frac {\sqrt{3}}{2}T$

Question

A long horizontal rod has a bead which can slide along its length and initially placed at a distance L from one end A of the rod. The rod is set in angular motion about A with constant angular acceleration $\alpha$ . If the co-efficient of friction between the rod and the lead is $\mu$ and gravity is neglected, then the time after which the bead starts slipping is

Answers

Correct	Answer Text
	$\mu/\sqrt{\alpha}$
	inifinitesimal
	$1/ \sqrt{)\mu \alpha)}$
	$\sqrt {(\mu/\alpha)}$

Question

A gramophone disc is revolving with an angular velocity $\omega$ . A coin is placed at a distance r from the centre of the disc. The static co-efficient of friction is $\mu$ . The coin will revolve with the record if

Answers

Correct	Answer Text
	$r \underline<\frac {\mu g}{\omega^2}$
	$r=\frac {\mu g}{\omega^2}$ only
	$r<\frac {\mu g}{\omega^2}$ only
	$r>\frac {\mu g}{\omega^2}$

Question

The fraction of the floating object of density d_s

above the surface of liquid of density d_L

will be

Answers

Correct	Answer Text
	$\frac {d_L - d_s}{d_L}$
	$\frac {d_L}{d_s}$
	$\frac {d_s}{d_L}$
	$\frac {d_s - d_L}{d_s}$

Question

A particle executing S.H.M. between x = - A and x = + A. The time taken for it to go from 0 to A/2 is T_1

and to go from A/2 to A is T_2

. Then

Answers

Correct	Answer Text

Question

In LCR series AC circuit, the voltage across each of the components L, C and R is 50V, the voltage across the LC combination will be

Answers

Correct	Answer Text
	zero volt
	$50\sqrt {2V}$
	50 V
	100 V

Question

If the intensity of radiation incident on a photocell be increased four time then number of photo-electrons and energy of photo-electrons emitted become

Answers

Correct	Answer Text
	four times, double
	four times, remain unchanged
	double, remain unchanged
	remain unchanged, doubled

Question

The work function of a substance is 4.0- eV. The longest wavelength of light that can cause photo-electron emission from this substance is approximately

Answers