# The number of wave lengths in the visible region in the spectrum is:

1.  4000

2.  6000

3.  8000

4.  Infinite

4

Infinite

Explanation :
No Explanation available for this question

# In tuninga Piano string, a fork of frequency 250vib/sec is used. As the wire is progressively tightened the number of beats decreases until the value is 4/sec. What will be the present frequency of the string

1.  246vib/sec

2.  250vib/sec

3.  254vib/sec

4.  260vib/sec

4

246vib/sec

Explanation :
No Explanation available for this question

# A line passing through places having value of magnetic dip is called:

1.  A clinic line

2.  Achonic line

3.  Isoclinic line

4.  Isogonic line

4

A clinic line

Explanation :
No Explanation available for this question

# The re-frangibility of red light is:

1.  Least

2.  Medium

3.  Most

4.  Nil

4

Least

Explanation :
No Explanation available for this question

# Photocell is a device which converts:

1.  Chemical energy in to electrical energy.

2.  Magnetic energy into electrical energy.

3.  Light energy into electrical energy.

4.  Electrical energy into light energy.

4

Light energy into electrical energy.

Explanation :
No Explanation available for this question

# The infra-red spectrum can be studied with the help of

1.  Quartz

2.  Flint glass prisms

3.  Crown glass prisms

4.  Rock-salt prisms

4

Rock-salt prisms

Explanation :
No Explanation available for this question

# The atomic power plants generate electricity, based on the principle of:

1.  Fission

2.  Fusion

3.   Nuclear dissipation

4.  Thermal combustion

4

Thermal combustion

Explanation :
No Explanation available for this question

# If a satellite is to be placed in a circular orbit at a pre-determined altitude, the Satellite:

1.  Must be raised to right altitude and must be given the right speed and direction.

2.  Must be raised to the right altitude and given the right speed.

3.  Need only to be raised to that altitude.

4.  None of these

4

Must be raised to right altitude and must be given the right speed and direction.

Explanation :
No Explanation available for this question

# Three capacitors 2.0, 3.0 and 6.0 micro farads are connected in series to a. 10 volt source, What will be the charge on the middle one

1.  5micro coulomb

2.  10micro coulomb

3.  11micro coulomb

4.  15micro coulomb

4

10micro coulomb

Explanation :
No Explanation available for this question

1.  300 volts

2.  230 volts

3.  190 volts

4.  100 volts

4