Physics - Questions and Answers, General Study (GK)

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551.

Gamma Rays are deflected by

(a)A magnetic field but not by an electric field

(b)An electric field but not by a magnetic field

(c)Neither an electric field nor magnetic field

(d)Both electric and magnetic field

Comment

Answer is: C

552.

A diode as a rectifier converts

(a)DC to AC

(b)AC to DC

(c)High voltage into low voltage and vica-versa

(d)Varying DC into constant DC

Comment

Answer is: B

553.

Penetrating power of X-rays does not depend on

(a)Potential difference

(b)Wavelength

(c)Energy

(d)Current in the filament

Comment

Answer is: D

554.

Which of the following statements are true?
1. All radioactive element decay exponentially with time.
2. Half life time of radioactive element in the time required for one half of the radioactive atoms to disintegrate.
3. Age of the earth can be determined by Radioactive dating.
4. Half life time of radioactive element is 50 percent of its average life period.
Select the correct answer using the codes given below

(a)1 and 2

(b)1, 3 and 4

(d)2 and 3

Comment

Answer is: C

555.

It is possible to understand Nuclear Fission on the basis of

(a)Meason theory of the nuclear forces

(b)Proton-Proton cycle

(c)Independent particle model of the nucleus

(d)Liquid Drop model of nucleus

Comment

Answer is: D

556.

In a discharge tube, ionization of enclosed gas is produced due to collisions between

(a)Negative electrons and neutral atoms/molecules

(b)Photons and neutral atoms/molecules

(c)Neutral gas atoms/molecules

(d)Positive ions and neutral atoms/molecules

Comment

Answer is: A

557.

When arsenic is added as an impurity to Silicon, the resulting material is

(a)P-type semiconductor

(b)N-type semiconductor

(c)N-type conductor

(d)None of the above

Comment

Answer is: B

558.

The electrical circuits used to get smooth DC output from a rectified circuit is called

(a)Amplifier

(b)Filter

(c)Oscillator

(d)Full wave rectifier

Comment

Answer is: B

559.

In a P-type semiconductor

(a)Electrons are the only carriers

(b)Holes are the only carriers

(c)Holes are the majority carriers and electrons are the minority carriers

(d)None of the above

Comment

Answer is: C

560.

Intelsat satellite works as a

(a)Transmitter

(b)Absorber

(c)Repeater

(d)None of the above

Comment

Answer is: C

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Physics - Questions and AnswersPage 56

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