NEET Biology Physics Chemistry question and answer by careeradvice.in

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A disc of radius 2 m and mass 100 kg rolls on
a horizontal floor. Its centre of mass has speed
of 20 cm/s. How much work is needed to stop it?

Which colour of the light has the longest wavelength?

In which of the following devices, the eddy
current effect is not used?

Body A of mass 4m moving with speed u
collides with another body B of mass 2m, at
rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is :

Ionized hydrogen atoms and α-particles with
same momenta enters perpendicular to a
constant magnetic field, B. The ratio of their radii of their paths rH : rα will be :

A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:

Pick the wrong answer in the context with rainbow.

An electron is accelerated through a potential
difference of 10,000 V. Its de Broglie
wavelength is, (nearly) : (me = 9 × 10–31 kg)