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QJEE MAIN 2019
In an amplitude modulator circuit, the carrier wave is given by, $C(t)=4 \sin (20000 \pi t)$ while modulating signal is given by, $...
JEE MainPhysicsMedium
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QJEE MAIN 2019
Let $z_0$ be a root of the quadratic equation, $x^2+x+1=0$. If $z=3+6 i z_0^{81}-3 i z_0^{93}$, then arg $z$ is equal to
JEE MainMathematicsEasy
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QJEE MAIN 2019
The ratio of the weights of a body on the Earth's surface to that on the surface of a planet is $9: 4$. The mass...
JEE MainPhysicsMedium
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QJEE MAIN 2019
To double the covering range of a TV transmission tower, its height should be multiplied by:
JEE MainPhysicsEasy
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QJEE MAIN 2019
Consider the LR circuit shown in the figure. If the switch $S$ is closed at $t=0$ then the amount of charge that passes through the...
JEE MainPhysicsMedium
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QJEE MAIN 2019
A body of mass 2 kg makes an elastic collision with a second body at rest and continues to move in the original direction but...
JEE MainPhysicsEasy
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QJEE MAIN 2019
An alpha-particle of mass m suffers 1-dimensional elastic collision with a nucleus at rest of unknown mass. It is scattered directly backwards losing, 64% of...
JEE MainPhysicsMedium
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QJEE MAIN 2019
If both the roots of the quadratic equation $x^2-m x+4=0$ are real and distinct and they lie in the interval $[1,5]$ then m lies in...
JEE MainMathematicsMedium
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QJEE MAIN 2019
A 10 m long horizontal wire extends from North East to South West. It is falling with a speed of $5.0 \mathrm{~ms}^{-1}$, at right angles...
JEE MainPhysicsMedium
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QJEE MAIN 2019
Two sources of sound $S_1$ and $S_2$ produce sound waves of same frequency 660 Hz . A listener is moving from source $S_1$ towards $S_2$...
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