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The total angle turned through during this interval is

  1. 48 rad

  2. 24 rad

  3. 96 rad

  4. 72 rad

3rd option is correct

\omega _{0}=0[initial]

\omega = 24 rad/s[final]

t=8sec

 \alpha = \frac{\omega }{t} = \frac{24}{8} = 3[angular acceleration]

\theta = \frac{1}{2} \alpha t^{2} = \frac{1}{2}\times 3 \times 8^{2} = 96 is the answer..!

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water column of height  7 cm. If refractive index of water is

  1. 1.269

  2. 1.286

  3. 1.259

  4. 1.310

It is given that wave number in 6cm of glass is the same as the wave number in water with height 7 cm. Let  is wavelength of light in glass and   is wavelength of light in water. According to question,  Also we know that relation between refractive index and wavelength,  Putting values,  Option (2) is correct  

The true power consumed in a.c. circuit is

  1. 400 W

  2. 600 W

  3. 220 W

  4. 800 W

Given, R = 18 ohm Z = 33 ohm Vrms = 220 V For calculating Power,  option (4) is correct

 

3. In which photo current is independent of intensity of incident radiation

4. Which may be operated in forward or reverse bias

Option (1) is correct Photo Diode is operated only in reverse bias

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