Free Printable Physics 2nd Half Book Test

1.

If the length of the conductor becomes half and the area is doubled then the resistance decreases by

a)

2 Times

b)

4 Times

c)

8 times

d)

None of these

2.

Of the following, the one which has a positive temperature Co-efficient of resistance is:

a)

Carbon

b)

Germanium

c)

Copper

d)

An electrolyte

3.

An atomic nucleus has mass

a)

Less than the total mass of their constituent protons and neutrons

b)

Equal to the total mass of their constituent protons and neutrons

c)

More than the total mass of their constituent protons and neutrons

d)

Sometimes more and sometimes less than the total mass of their constituent protons and neutrons

4.

Radioactive substance do not emit

a)

$\alpha-rays$

b)

$\beta-rays$

c)

$\gamma-rays$

d)

Neutrons

5.

The ratio of radius of 3rd to 1st Bohr’s orbit is

a)

3:1

b)

9:1

c)

1:3

d)

None

6.

Which one of the following radiations has more energy photons?

a)

$X-rays$

b)

Radio waves

c)

$\gamma-rays$

d)

Micro waves

7.

The radius of 10th orbit of hydrogen atom is

a)

0.53nm

b)

53 nm

c)

5.3 nm

d)

0.053 x 10^-9 nm

8.

In photoelectric effect, which factor increases by increasing the intensity of incident photon?

a)

Kinetic energy of electrons

b)

Work function

c)

Stopping potential

d)

Number of emitted electrons

9.

In photoelectric effect, if the intensity of light in made twice than initial value. The maximum K.E of photoelectron becomes

a)

Same

b)

Four times

c)

Double

d)

Half

10.

A Baryon is formed by quarks.

a)

4

b)

6

c)

3

d)

10

11.

The ratio of the number of turns in primary and secondary coils of a transformer is 1: 20. The ratio of the currents in the primary and secondary coils will be

a)

1 : 20

b)

1 : 400

c)

20 : 1

d)

400 : 1

12.

A steady current is flowing in a conductor of non-uniform cross-section. The charge passing through any cross-section per unit time is

a)

Directly proportional to the area of cross-section

b)

Inversely proportional to the area of cross-section

c)

Proportional to square of the area of cross-section

d)

Independent of the area of cross-section

13.

When Cu and Ge are cooled to – 150oC Then resistance of Cu and that of Ge

a)

Increases, increases

b)

Increases, decreases

c)

Decreases, decreases

d)

Decreases, increases

14.

Potential due to charge q at distance 1m is 5V, at distance 3m will be

a)

5/3 V

b)

7/3 V

c)

3/5 V

d)

3/7 V

15.

A charged particle of energy 15 eV moves through perpendicular magnetic field. The energy of the particle on emerging out of the magnetic field is

a)

15 eV

b)

>15eV

c)

<15eV

d)

15V

16.

An a -particle moves at right angles to a uniform magnetic field of 0.5 T with a speed of 5×10⁶ ms^-1. The force experienced by a -particle is

a)

4×10^-13N

b)

8×10^-13N

c)

4×10^-11N

d)

8×10^-11N

17.

A coil having an area A0 is placed in a magnetic field which changes from B0 to 4 B0 in time interval t. The emf induced in the coil will be

a)

$3A_oB_o/t$

b)

$4A_oB_o/t$

c)

$3B_o/A_ot$

d)

$4B_o/A_ot$

18.

The potential difference 0.7 volt develops across the depletion region of silicon semi- conductor due to

a)

electron hole pairs

b)

the biasing voltage

c)

charge on the ions

d)

stopping potential

19.

The current in a wire directed towards East and placed in magnetic field directed North the force on wire is

a)

Due South

b)

Into the paper

c)

Out of paper

d)

Due North

20.

In the half life of a radioactive substance the decayed atoms are

a)

1/2 of the original

b)

1/4 of the original

c)

1/16 of the original

d)

1/8 of the original

21.

How much K.E will be gained by an electron in going from 20 V to 40 V

a)

20 V

b)

50 eV

c)

20 eV

d)

None of these

22.

In the given figure the current through the resistor is practically.

a)

5 A

b)

Zero

c)

2 A

d)

1 A

23.

According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal Vs the frequency, of the incident radiation gives a straight line whose slope

a)

Depends both on the intensity of the radiation and the metal used

b)

Depends on the intensity of the radiation

c)

Depends on the nature of the metal used

d)

Is the same for all metals and independent of the intensity of the radiation

24.

What is the current in a $2\times10^6$ ohm resistors having a potential difference of $2\times10^3$ volts?

a)

10^-1 A

b)

10^-4 A

c)

10^-2 A

d)

1 m A

25.

The current in the branch AB is

a)

1A

b)

2A

c)

1.5A

d)

3A

26.

Sources of magnetic field are

a)

current carrying conductors

b)

moving charged particle

c)

variable electric field

d)

all of these

27.

The activity of a radioactive sample is 1.6 curie and its half-life is 2.5 days. Its activity after 10 days will be:

a)

0.8 curie

b)

0.1 Curie

c)

0.4 Curie

d)

0.16 Curie

28.

A certain element have B.E of 100 MeV. It releases further 10MeV. The new B.E of the element will be

a)

100MeV

b)

50Mev

c)

110Mev

d)

90Mev

29.

Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is:

a)

zero

b)

along the diagonal AC

c)

along the diagonal BD

d)

perpendicular to side AB

30.

The energy levels of the hydrogen spectrum is shown in figure. There are some transitions A, B, C, D and E. Transition A, B and C respectively represent

a)

series limit of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series

b)

first member of Lyman series, third spectral line of Balmer series and the second spectral line of Paschen series

c)

ionization potential of hydrogen, second spectral line of Balmer series and third spectral line of Paschen series

d)

series limit of Lyman series, second spectral line of Balmer series and third spectral line of Paschen series

31.

The half-life of radioactive substance is six years. The time taken by 12grams of the substance to decay completely will be?

a)

$\infty$

b)

18 years

c)

48 years

d)

72 years

32.

A piece of wire of resistance 4 ohm is bent through 180o at its mid-point and the two halves are twisted together. Then the resistance is

a)

8 ohm

b)

2 ohm

c)

1 ohm

d)

5 ohm

33.

Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt respectively are connected in series across a potential difference of 300 volt, then

a)

X will glow brighter

b)

heat produced in Y will be greater than X

c)

resistance of Y is greater than X

d)

voltage drop in X will be greater than Y

34.

A 0.1 m long conductor carrying a current of 50 A is perpendicular to a magnetic field of 1.25 mT. The mechanical power required to move the conductor with a speed of 1 $ms^{-1}$ is

a)

6.25 m W

b)

0.625 W

c)

6.25 W

d)

1 W

35.

It takes 4.2 eV to remove one of the least tightly bound electrons from a metal surface. When UV photons of a single frequency strike a metal, electrons with kinetic energies ranging from 0 to 2.6 eV are ejected. The energy of incident photon is

a)

2.6 eV

b)

13.6 eV

c)

6.8 eV

d)

13.6/4 eV

36.

What is the area of the plates of a 3F parallel plate capacitor, if the separation between the plates is 5 mm?

a)

$1.7\times10^9m^2$

b)

$4.5\times10^9m^2$

c)

$9.3\times10^9m^2$

d)

$12.9\times10^9m^2$

37.

How many electrons per second constitute a current of one micro ampere?

a)

One electron

b)

10⁶ electrons

c)

10^–6 electrons

d)

$6.25\times10^{12}electrons$

38.

A 50 volt battery is connected across a 10 ohm resistor. The current is 4.5 ampere. The internal resistance of the battery is

a)

Zero

b)

1.1 ohm

c)

0.5 ohm

d)

5.0 ohm

39.

The diagram shows a model of an atom in which two electrons move around a nucleus in a circular orbit. The electrons complete one full orbit in $1.0\times10^{-15}$ s.

Which is the current caused by the motion of the electrons in the orbit?

a)

$1.6\times10^{-34}A$

b)

$1.6\times10^{-4}A$

c)

$3.2\times10^{-34}A$

d)

$3.2\times10^{-4}A$

40.

A cell of emf E Volt and internal resistance r ohm is being charged with a current of i amp. Then the terminal potential difference is

a)

E

b)

E + ir

c)

E – ir

d)

E – iR

Physics 2nd Half Book Test

Total questions: 40

Worksheet time: 40mins

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