NTA JEE Main 9th April 2016 Online

Microwave oven acts on the principle of:

To find the focal length of a convex mirror, a student records the following data:
Object pin: 22.2 cm, Convex Lens: 32.2 cm, Convex Mirror: 45.8 cm, Image Pin: 71.2 cm
The focal length of the convex lens is $$f_1$$ and that of mirror is $$f_2$$. Then taking index correction to be negligibly small, $$f_1$$ and $$f_2$$ are close to:

A convex lens, of focal length 30 cm, a concave lens of focal length 120 cm, and a plane mirror are arranged as shown. For an object kept at a distance of 60 cm from the convex lens, the final image, formed by the combination, is a real image, at a distance of:

In Young's double-slit experiment, the distance between slits and the screen is 1 m and monochromatic light of wavelength 600 nm is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular distance $$d_0$$ between the slits. If the angular resolution of the eye is $$\frac{1}{60}°$$, then the value of $$d_0$$ is close to

When photons of wavelength $$\lambda_1$$ are incident on an isolated sphere, the corresponding stopping potential is found to be $$V$$. When photons of wavelength $$\lambda_2$$ are used, the corresponding stopping potential was thrice that of the above value. If light of wavelength $$\lambda_3$$ is used then find the stopping potential for this case:

An electron in a hydrogen atom makes a transition from $$n = 2$$ to $$n = 1$$ and emits a photon. This photon strikes a doubly ionized lithium atom which was already in an excited state and completely removes the orbiting electron. The least quantum number for the excited state of the lithium-ion for the process is

An unknown transistor needs to be identified as a npn or pnp type. A multimeter, with +ve and -ve terminals, is used to measure resistance between different terminals of transistor. If terminal 2 is the base of the transistor then which of the following is correct for a pnp transistor?

A Zener diode with a breakdown voltage of 4 V is connected in series with a resistance $$R$$ to a battery of emf 10 V. The maximum power dissipation rating for the Zener diode is 1 W. The value of $$R$$ to ensure maximum power dissipation across the diode is

The truth table given in fig. represents:

An audio signal consists of two distinct sounds: one a human speech signal in the frequency band of 200 Hz to 2700 Hz, while the other is a high frequency music signal in the frequency band of 10200 Hz to 15200 Hz. The ratio of the AM signal band width required to send both the signals together to the AM signal band width required to send just the human speech is: