A sound wave travels with a velocity of 300 ms-1 through a gas 9 beats are produced in 3 sec when two waves pass through it simultaneously. If one of the waves has 2 m wavelength, the wavelength of the other wave is:

1.  1.98 m

2.  2.04 m

3.  2.00 m

4.  1.99 m

View Answer  
4
Correct Answer :

2.04 m


Explanation :
No Explanation available for this question

A ray of light travels from an optically denser medium towards rarer medium. The critical angle for the two media is 'C'. The maximum possible angle of deviation of the ray is:

1.  π/2 - C

2.  π -2C

3.  2C

4.  π/2 + C

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4
Correct Answer :

π -2C


Explanation :
No Explanation available for this question

The magnification produced by an astronomical telescope for normal adjustment is 10 and the length of the telescope is 1:1 m. The magnification, when the image is formed at least distance of distinct vision is:

1.  6

2.  14

3.  16

4.  18

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4
Correct Answer :

14


Explanation :
No Explanation available for this question

A thin prism of angle 60 made up of glass of refractive index 1.5 is combined with another prism made up of glass of refractive index 1.75 to produce dispersion without deviation. The angle of second prism is:

1.  70

2.  90

3.  40

4.  50

View Answer  
4
Correct Answer :

40


Explanation :
No Explanation available for this question

If the ratio of maximum and minimum intensities of an interference pattern is 36:1, then the ratio of amplitudes of the two interfering waves will be:

1.  3:7

2.  7:4

3.  4:7

4.  7:5

View Answer  
4
Correct Answer :

7:5


Explanation :
No Explanation available for this question

A short magnet oscillating in vibration magnetometer with a frequency 10 Hz. A downward current of 15 A is established in a long vertical wire placed 20 cm to the west of the magnet. The new frequency of the short magnet is: (The horizontal component of earth's magnetic field is 12 μT)

1.  4 Hz

2.  2.5 Hz

3.  9 Hz

4.  5 Hz

View Answer  
4
Correct Answer :

5 Hz


Explanation :
No Explanation available for this question

A short bar magnet is arranged with its north pole pointing geographical north. It is found that the horizontal component of earth’s magnetic induction (BH) is balanced by the magnetic induction of the magnet at a point which is at a distance of 20 cm from its centre. The magnetic moment of the magnet is: (if BH = 4 x 10-5 Wb m-2)

1.  3.2 A-m2

2.  1.6 A-m2

3.  6.4 A-m2

4.  0.8 A-m2

View Answer  
4
Correct Answer :

3.2 A-m<sup>2</sup><sup></sup>


Explanation :
No Explanation available for this question

The plates in a parallel plate capacitor are separated by a distance 'd' with air as the medium between the plates. In order to increase the capacity by 66%, a dielectric slab of dielectric constant '5' is introduced between the plates. What is the thickness of the dielectric slab

1.  d/4

2.  d/2

3.  5d/8

4.  d

View Answer  
4
Correct Answer :

d/2


Explanation :
No Explanation available for this question

Four charges of magnitude '-Q' are placed at the four corners of a square and a charge 'q' is at its centre. If the system is in equilibrium the value of 'q' is:

1.  - Q/4(1+2√2)

2.  Q/4(1+2√2)

3.  Q/2(1+2√2)

4.  Q/2(1+√2)

View Answer  
4
Correct Answer :

Q/4(1+2&#8730;2)


Explanation :
No Explanation available for this question

A battery of e.m.f. 2.1 V and internal resistance 0.05 Ω is shunted for 5 seconds by a wire of constant resistance 0.02 Ω, mass 1 g and specific heat 0.1cal/g/0C. The rise in the temperature of the wire is:

1.  10.70C

2.  21.40C

3.  1070C

4.  2140C

View Answer  
4
Correct Answer :

214<sup>0</sup>C


Explanation :
No Explanation available for this question
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