MCQ
Wave front formed by the collimator of a spectrometer:
  • A
    Plane
  • B
    Spherical
  • C
    Cylindrical
  • D
    Paraboloidal

Answer

  1. Spherical

Explanation:

Wave front formed by the collimator of a spectrometer is a plane wave front, when r lit is in the focus.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

In an ac circuit, the potential differences across an inductance and resistance joined in series are, respectively, 16V and 20V. The total potential difference across the circuit is.
Two files lines can ____.
A capacitor C1 of capacitance $1\mu\text{F}$ and a capacitor C2 of capacitance $2\mu\text{F}$ are separately charged by a common battery for a long time. The two capacitors are then separately discharged through equal resistors. Both the discharge circuits are connected at t = 0.

Assertion   :   When a magnet is brought near iron nails, only translatory force act on it.

Reason      : The field due to a magnet is generally uniform.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

In the context of Doppler effect in light, the term ‘red shift’ signifies

(a) Decrease in frequency

(b) Increase in frequency

(c) Decrease in intensity

(d) Increase in intensity

In a laboratory experiment on emission from atomic hydrogen in a discharge tube, only a small number of lines are observed whereas a large number of lines are present in the hydrogen spectrum of a star. This is because in a laboratory:

Assertion  :   Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron.

Reason      : A charged particle produces a magnetic field.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

If the forward voltage in a semiconductor diode is doubled, the width of the depletion layer will

(a) Become half

(b) Become one-fourth

(c) Remain unchanged

(d) Become double

The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an ac supply of 120 V and the current flowing in it is 10 A. The voltage and the current in the secondary are

(a) 240 V, 5 A

(b) 240 V, 10 A

(c) 60 V, 20 A

(d) 120 V, 20 A

Magnifying glass forms: