Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 7

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Weekly Quiz Competition

Question 1
4 / -1

Electron of mass m and charge e in external field E experiences acceleration

A

B

C

D
Question 2
4 / -1

The specific charge of a proton is 9.6 × 10⁷ C kg^-1 . The specific charge of an α -particle will be

A
9.6 × 10⁷ C kg^-1

B
19.2 × 10⁷ C kg^-1

C
4.8 × 10⁷ C kg^-1

D
2.4 × 10⁷ C kg^-1
Question 3
4 / -1

A
1

B
zero

C
g_e / g_m

D
g_m / g_e
Question 4
4 / -1

A charged oil drop is suspended in uniform field of 3 × 10⁴ Vm^-1,so that it neither falls nor rises. The charge on the drop will be (take, the mass of the charge = 9.9 × 10 ^-15 kg and g = 10 ms ^-2 )

A
3.3 × 10 ^-18 C

B
3.2 × 10 ^-18 C

C
1.6 × 10 ^-18 C

D
4.8 × 10 ^-18 C

Solution
Question 5
4 / -1

Cathode rays of velocity 10⁶ms ^-1 describe an approximate circular path of radius 1 m in an electric field 300 Vcm^-1. If the velocity of the cathode rays are doubled. The value of electric field so that the rays describe the same circular path, will he

A
2400 V cm^-1

B
600 V cm^-1

C
1200 V cm^-1

D
12000 V cm^-1
Question 6
4 / -1

When a high energy UV photon beam enters an electric field, it will be

A
accelerated

B
retarded

C
undeflected

D
None of these
Question 7
4 / -1

An α-particle of energy 5 MeV is scattered through 180° by a fixed uranium nucleus. The distance of the closest approach is of the order of

A
1 Å

B
10 ^-10 cm

C
10 ^-12 cm

D
10 ^-15 cm

Solution
Question 8
4 / -1

In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. The path of the particle will be a

A
helix

B
straight line

C
ellipse

D
circle
Question 9
4 / -1

The matertial used lot making thermionic cathode must have

A
low work function and low melting point

B
low work function and high melting point

C
high work function and high melting point

D
high work function and low melting point
Question 10
4 / -1

J J Thomson's cathode rays 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