Free Printable Dual Nature of matter & Radiation, Atoms and nuclei, Electronic

1.

The photoelectric work function for a metal surface is 4.14eV.The cutoff wavelength for this

a)

4125 A⁰

b)

2062.5 A⁰

c)

3000 A⁰

d)

6000 A⁰

2.

Maximum K.E of emitted electron depends on the frequency of incident photon when frequency of incident photons is

a)

equal to threshold frequency

b)

half of threshold frequency

c)

greater than threshold frequency

d)

one third of threshold frequency

3.

The slope of frequency of incident ray and stopping potential for a given surface

a)

h

b)

h/e

c)

eh

d)

e

4.

The photoelectric cut off voltage in a certain experiment is 1.5V. What is the max. K.E of photoelectrons emitted?

a)

1.5 eV

b)

0.5 eV

c)

2 eV

d)

1eV

5.

THE SLOPE OF the cut off voltage versus frequency of incident light is found to be 4.12 $\times$ $10^{-15}$ Vs.Given e =1.6 $\times$ $10^{-19}$ C CALCULATE THE VALUE 0f plancks constant

a)

5.592 $\times$ $10^{-34}$ Js

b)

6.592 $\times$ $10^{-34}$ Js

c)

5.592

d)

6.592

6.

What is the momentum of an electron with K.E of 120eV

a)

5.88 $\times$ $10^{-24}$ kg m/s

b)

6.88 $\times$ $10^{-24}$ kg m/s

c)

120 kg m/s

d)

1.6 $\times$ $10^2$ kg m/s

7.

stopping potential depends on intensity of incident light

a)

true

b)

photons

c)

frequency

d)

none

8.

Kinetic energy of emitted electrons depends upon :

a)

(a) frequency

b)

(b) intensity

c)

(c) nature of atmosphere surrounding the electrons

d)

(d) none of these

9.

De-Broglie wavelength of a body of mass m and kinetic energy E is given by (symbols have their usual meanings):

a)

(a) h/√2mE

b)

(b) h/2mE

c)

(c)√ 2mE/h

d)

(d) h/mE

10.

The work function of photoelectric material is 3.3 eV. The threshold frequency will be equal to:

a)

(a) 8 × 10¹⁴ Hz

b)

(b) 8 × 10¹⁰ Hz

c)

(c) 5 × 10¹⁰ Hz

d)

(d) 4 × 10¹⁴ Hz

11.

The momentum of an electron that emits a wavelength of 2 Å. will be:

a)

(a) 6.4 × 10^-36 kgms^-1

b)

(b) 3.3 × 10^-24 kgms^-1

c)

(c) 3.3 × 10^-34 kgms^-1

d)

(d) none of these

12.

Name the series of hydrogen spectrum which lie in the ultraviolet and visible region

(a)

13.

The ground state energy of hydrogen atom is -13.6 eV. What are the kinetic and

potential energies of the electron in this state

a)

13.6 eV and 27.2 eV

b)

-13.6eV and 27.2 eV

c)

13.6 and -27.2 eV

d)

None

14.

The total energy of an electron in the first excited state of hydrogen atom is about - 3.4 eV. Its kinetic energy in this state is:

a)

3.4 eV

b)

-6.8 eV

c)

-3.4 eV

d)

6.8 eV

15.

What do these isotopes of carbon all have in common?

¹²₆C, ¹³₆C, ¹⁴₆C

a)

they all have the same number of neutrons & mass number

b)

they all have the same atomic number and neutrons

c)

they all have the same atomic number and electrons

d)

they all have the same number of protons, atomic number, and mass number

16.

Takes two small nuclei and combines them into a larger nucleus

a)

fission

b)

fusion

17.

Very high temperature and pressure is required for:

a)

Fission

b)

Fusion

c)

Radioactive Decay

18.

What is a chain reaction?

a)

When electrons are emitted causing electricity

b)

When a nuclear fission reaction occurs, the protons emitted can strike other nuclei in the sample, and cause them to split

c)

When a nuclear fission reaction occurs, the neutrons emitted can strike other nuclei in the sample, and cause them to split

d)

When a nuclear fission reaction occurs, the electrons emitted can strike other nuclei in the sample, and cause them to split

19.

An example of an uncontrolled fission reaction is _______________

a)

Nuclear power plants

b)

Radio active decay

c)

Atomic Bomb

d)

On the surface of the sun

20.

The energy equivalent in joules of the mass of

2.0 *10^-31 𝑘𝑔 _____.

a)

2.0 *10^-31𝐽

b)

6.0 *10^-23 𝐽

c)

1.8 * 10^-14𝐽

d)

8.2 * 10^-14 𝐽

21.

The nuclear reaction

H_1^2+H_1^3\ ->\ He_2^4+n_0^1

is an example of

a)

nuclear fission

b)

radioactive decay

c)

nuclear fusion

d)

artificial transmutation

22.

If the binding energy of the deutrium is 2.23 MeV . The mass defect given in a.m.u. is

a)

-0.0024

b)

-0.0012

c)

0.0012

d)

0.0024

23.

r₁ and r₂ are the radii of atomic nuclei of mass numbers 64 and 27 respectively. The ratio (r₁ /r₂) is

a)

64/27

b)

27/64

c)

4/3

d)

1

24.

What is the name of the circuit as shown?

a)

Half-wave rectifier

b)

Full-wave rectifier

c)

Full-wave bridge rectifier

d)

Secondary rectifier

25.

1. The resistivity of a semiconductor lies between

a)

(a)10^-6Ωm to10^-8Ωm

b)

n(b) 10⁸Ωm to10¹⁴Ωm

c)

(c) 10^-2Ωm to10⁴Ωm

d)

(d) none of these

26.

2. The forbiddenn energy gap for Germanium is of the order of

a)

(a) 0.7 eV

b)

(b) 0.3 eV

c)

(c) 1.1 eV

d)

(d) 10 eV

27.

The reverse saturation current in a PN Junction diode is only due to

a)

majority carriers

b)

minority carriers

c)

acceptor ions

d)

donor ions

28.

Doping of Semiconductors

a)

materials which can conduct electricity better than insulator, but not as well as conductors.

b)

The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.

c)

when 4 electrons in outermost orbit.

29.

which statement is correct? (the dark circles represent the electrons)

a)

p-type of the diode is connected to the negative terminal.

b)

Electron moves across the p-n junction, makes the diode forward biased

c)

current will not flow in the circuit

d)

reverse biased circuit

30.

Let n_p and n_e be the number density of holes and conduction electrons respectively in a semiconductor. Then,

a)

n_{p >}n_e in an intrinsic semiconductor, I < I_p + I_e

b)

n_{p =}n_e in an extrinsic semiconductor, I > I_p + I_e

c)

n_{p =}n_e in an intrinsic semiconductor, I = I_p + I_e

d)

n_{p >}n_e in an intrinsic semiconductor, I = 0( Here, I_p = current due to holes,I_e= current due to electrons, I= total current)

31.

During formation of p-n junction

a)

an electron diffuses from n to p side

b)

a hole diffuses from p to n side

c)

a hole diffuses from n to p side

d)

an electron diffuses from p to n side

32.

What is the name of this component?

a)

PN junction

b)

LED

c)

silicon

d)

PNP

33.

Diode

a)

allows current to flow in one direction

b)

allows current to flow in two directions

c)

is a resistor

34.

Which of the following statements is incorrect for the depletion region of a diode?

a)

There the mobile charges exist.

b)

Equal number of holes and electrons exist, making the region neutral.

c)

Recombination of holes and electrons has taken place.

d)

None of these

35.

Potential barrier developed in a junction diode opposes the flow of

a)

minority carrier in both regions only

b)

majority carriers only

c)

majority carriers only

d)

holes in p region

36.

If the energy of a photon of sodium light (A = 589 nm) equals the band gap of semiconductor, the minimum energy required to create hole electron pair

a)

1.1 eV

b)

2.1 eV

c)

3.2 eV

d)

1.5 eV

37.

The mass of nitrogen-14 is $14.003074u$ .

What is this in kilograms?

a)

$2.0\times10^{-26}kg$

b)

$2.1\times10^{-26}kg$

c)

$2.2\times10^{-26}kg$

d)

$2.3\times10^{-26}kg$

38.

What is the mass defect for $N_7^{14}$ ?
$m_p=1.007276u$
$m_n=1.008664u$
$m_{N-14}=14.003074u$

a)

$0.10850u$

b)

$0.10851u$

c)

$0.10852u$

d)

$0.10853u$

39.

Calculate the energy released by a mass defect of $0.1085u$

a)

$1.3\times10^{-11}J$

b)

$1.4\times10^{-11}J$

c)

$1.5\times10^{-11}J$

d)

$1.6\times10^{-11}J$

40.

Calculate the binding energy per nucleon for $O_8^{10}$ with mass $17.99916u$ .

undefined,undefined

a)

7.3MeV

b)

7.4MeV

c)

7.5MeV

d)

7.6MeV

Dual Nature of matter & Radiation, Atoms and nuclei, Electronic

Total questions: 40

Worksheet time: 21mins

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