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Physics - (24-Oct-2016)

Physics - (24-Oct-2016)
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Ques: 1

A 50 kg sphere is projected vertically upwards with a speed of $$200 ms^{-1}$$ . It rises to a height of 1500m. The energy used up in overcoming the friction is

$$2.65 \times 10^{5} J$$

$$5.6 \times 10^{5} J$$

20 J

Zero

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Ques: 2

A circular disc is rotating about its own axis. An external opposing torque of magnitude $$0.02 Nm$$ is applied on the disc, due to which it comes to rest in $$5$$ seconds. The initial angular momentum of the disc is

0.1 $$kgm^{2}s^{-1}$$

0.04 $$kgm^{2}s^{-1}$$

0.025 $$kgm^{2}s^{-1}$$

0.01 $$kgm^{2}s^{-1}$$

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Ques: 3

The work done in rotating the magnet from the direction of uniform field to the opposite direction to the field is $$W$$ . The work done in rotating the magnet from the field direction to half the maximum couple position is

$$2W$$

$$\frac{\sqrt{3}W}{2}$$

$$\frac{W}{4}(2-\sqrt{3})$$

$$\frac{W}{4}(1-\sqrt{3})$$

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Ques: 4

The nuclei $$_{6}C^{13}$$ and $$_{7}N^{14}$$ can be described as

Isotones

Isobars

Isomers

Isotopes

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Ques: 5

In Young's experiment the wavelength of red light is $$7.5 \times 10^{-5}$$ cm and that of blue light is $$5.0 \times 10^{-5}$$ cm. The value of $$n$$ for which $$(n+1)$$ th blue bright band coincides with $$n$$ th red band, is

8

4

2

1

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