Q1 NEET 2010 · AIPMT · PRELIMS Easy ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
A beam of cathode rays is subjected to crossed electric (E) and magnetic fields (B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (Where V is the potential difference between cathode and anode)
(a) B 2 2 V E 2 \frac{B^2}{2VE^2} 2 V E 2 B 2 (b) 2 V B 2 E 2 \frac{2VB^2}{E^2} E 2 2 V B 2 (c) 2 V E 2 B 2 \frac{2VE^2}{B^2} B 2 2 V E 2 (d) E 2 2 V B 2 \frac{E^2}{2VB^2} 2 V B 2 E 2 Show answer and solution
Answer: (d)
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Report a mistake Q2 NEET 2008 · AIPMT Easy ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of
(a) collisions between the charged particles emitted from the cathode and the atoms of the gas (b) collision between different electrons of the atoms of the gas (c) excitation of electrons in the atoms (d) collision between the atoms of the gas Show answer and solution
Answer: (a)
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Report a mistake Q3 NEET 2007 · AIPMT Medium ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off, and the same magnetic field is maintained, the electrons move
(a) in a circular orbit (b) along a parabolic path (c) along a straight line (d) in an elliptical orbit. Show answer and solution
Answer: (a)
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Report a mistake Q4 NEET 2006 · AIPMT Easy ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
In a discharge tube ionization of enclosed gas is produced due to collisions between
(a) neutral gas atoms/molecules (b) positive ions and neutral atoms/molecules (c) negative electrons and neutral atoms/molecules (d) photons and neutral atoms/molecules. Show answer and solution
Answer: (c)
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Report a mistake Q5 NEET 2003 · AIPMT Easy ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
J.J. Thomson's cathode-ray tube experiment demonstrated that
(a) cathode rays are streams of negatively charged ions (b) all the mass of an atom is essentially in the nucleus (c) the e/m of electrons is much greater than the e/m of protons (d) the e/m ratio of the cathode-ray particles changes when a different gas is placed in the discharge tube Show answer and solution
Answer: (c)
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Report a mistake Q6 NEET 2002 · AIPMT Easy ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
Which of the following is not the property of cathode rays?
(a) In produces heating effect (b) It does not deflect in electric field (c) It casts shadow (d) It produces fluorscence. Show answer and solution
Answer: (b)
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Report a mistake Q7 NEET 2001 · AIPMT Medium ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
In Thomson mass spectrograph E ⃗ ⊥ B ⃗ \vec{E} \perp \vec{B} E ⊥ B
(a) (b) E ⃗ × B ⃗ \vec{E} \times \vec{B} E × B (c) (d) E ⃗ 2 B ⃗ 2 \frac{\vec{E}^2}{\vec{B}^2} B 2 E 2 Show answer and solution
Answer: (a)
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Report a mistake Q8 NEET 1997 · AIPMT Easy ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
The kinetic energy of an electron, which is accelerated in the potential difference of 100 volts, is
(a) 416.6 cal (b) 6.636 cal (c) 1.602 × 1 0 − 17 1.602 \times 10^{-17} 1.602 × 1 0 − 17 (d) 1.6 × 1 0 4 1.6 \times 10^{4} 1.6 × 1 0 4 Show answer and solution
Answer: (c)
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Report a mistake Q9 NEET 1996 · AIPMT Easy Old syllabus ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
In a discharge tube at 0.02 mm, there is formation of
(a) Crooke's dark space (b) Faraday's dark space (c) both space partly (d) none of these Show answer and solution
Answer: (a)
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Report a mistake Q10 NEET 1996 · AIPMT Easy ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
An electron of mass m m m e e e V V V
(a) 2 e V m \sqrt{\frac{2eV}{m}} m 2 e V (b) e V m \sqrt{\frac{eV}{m}} m e V (c) e V 2 m \frac{eV}{2m} 2 m e V (d) e V m \frac{eV}{m} m e V Show answer and solution
Answer: (a)
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Report a mistake Q11 NEET 1990 · AIPMT Easy ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
In which of the following, emission of electrons does not take place
(a) thermionic emission (b) X-rays emission (c) photoelectric emission (d) secondary emission Show answer and solution
Answer: (b)
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Report a mistake Q12 NEET 1988 · AIPMT Easy ☆
Cathode Rays, Thomson's Experiment & Gas Discharge
(a) protons (b) electrons (c) photons (d) positrons Show answer and solution
Answer: (b)
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