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Метод рк2 151-200

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

In the loupe the object must be placed:

a)

behind the double focus

b)

the distance between the magnifying glass and the object must be equal to the focus

c)

the subject can be placed anywhere.

d)

between the focus and the double focus

e)

between the magnifying glass and the focus

2.

Specify an optical device whose action is not based on the laws of geometrical optics:

a)

microscope

b)

binoculars

c)

diffraction grating

d)

magnifying glass

e)

telescope

3.

In a scattering lens, an image:

a)

depends on the distance from the object to the lens.

b)

upside down

c)

true size

d)

direct magnified

e)

reduced direct

4.

What is the optical power of a collecting lens with focal length 20 cm:

a)

-0,05 dioptres.

b)

-5 dioptres

c)

0,5 diopters

d)

0,05 dioptres

e)

5 diopters

5.

Signs of wave coherence include: 1) constancy of amplitudes; 2) constancy and equality of frequencies; 3) the same direction of oscillations; 4) a constant phase difference at the point of observation for a time interval commensurate with the generation time of the receiver:

a)

1 and 2

b)

1, 2, 3, 4

c)

1, 2, 3

d)

2,3.

e)

3 and 4

6.

The electric charge in a conductor, the current in which increases uniformly in 6 seconds from 0 to 4 A, is equal:

a)

12 pCl

b)

12 mCl

c)

1200 mCl

d)

0,012 Cl

e)

12 Cl

7.

According to superposition principle for potential:

a)

Potentials are multiplied.

b)

Potentials add vectorially.

c)

Potentials add arithmetically.

d)

Potentials add algebraically.

e)

Potentials are subtracted.

8.

Interference is:

a)

decomposition of white light by colors

b)

superposition of any waves.

c)

waves bending around obstacles

d)

decomposition of white color by wavelengths

e)

superposition of coherent waves

9.

Diffraction is:

a)

white color decomposition

b)

superposition of any waves

c)

decomposition of white light by wavelengths.

d)

superposition of coherent waves on each other

e)

the enveloping of obstacles by waves

10.

Dispersion is:

a)

superposition of coherent waves on each other

b)

white color decomposition by wavelengths.

c)

decomposition of white light by colors

d)

waves around obstacles

e)

superposition of any waves

11.

At the center of a diffraction pattern on a small circular screen is observed:

a)

dark or light depending on the distance of the screen from the observation point

b)

dark spot

c)

the picture changes over time.

d)

a light spot

e)

dark or light depending on the size of the screen

12.

At the center of the diffraction pattern on a small circular aperture is observed:

a)

the size of the hole doesn't matter.

b)

dark spot

c)

light spot

d)

dark or light depending on the size of the hole

e)

the picture changes over time

13.

In terms of wave optics, (indicate incorrect answer) are explained:

a)

dispersion

b)

photoelectric effect

c)

polarization

d)

interference

e)

diffraction

14.

In terms of quantum (corpuscular) optics are explained:

a)

dispersion

b)

polarization

c)

photoelectric effect

d)

diffraction

e)

interference

15.

The photo effect is:

a)

superposition of coherent waves on each other

b)

waves around obstacles

c)

ordering of light oscillations.

d)

superposition of any waves

e)

the pulling of electrons out of matter by light

16.

The number of electrons torn out by light from the surface of a metal in 1 s:

a)

directly proportional to the frequency of incident light

b)

inversely proportional to the wavelength

c)

is directly proportional to the energy of the light wave absorbed during this time

d)

inversely proportional to incident light frequency

e)

directly proportional to the wavelength

17.

Maximum kinetic energy of photoelectrons:

a)

independent of wavelength.

b)

light intensity dependent

c)

independent on light frequency

d)

linearly decreases with light frequency

e)

linearly increases with light frequency

18.

The photo effect is observed:

a)

at any frequency of incident light

b)

at v min

c)

at л<л кр .

d)

at v min>v kp , where v kp is the red boundary of the photoelectric effect

e)

at any wavelength of incident light

19.

Quantum (corpuscular) theory of light explains (specify wrong answer):

a)

photo effect and radiation

b)

Compton scattering

c)

dispersion

d)

photoelectric effect

e)

radiation of bodies

20.

Characteristics of photons are (specify incorrect answer):

a)

mass m=hv/c2 .

b)

impulse p=h/л

c)

energy E=hл

d)

impulse p=hл

e)

energy Е=mс2

21.

Rutherford's experiments on the scattering of particles by gold foil prove:

a)

that the electrons revolve around the nucleus.

b)

the presence of a nucleus in the atom

c)

that the atom is a positively charged ball in which electrons are "embedded

d)

the presence of electrons in the atom

e)

the fact that the masses of the nucleus and electrons in the atom are commensurable

22.

Bohr's model of the atom based on his postulates explains (specify wrong answer):

a)

regularities in atomic spectra

b)

quantum character of light emission by a hydrogen atom

c)

patterns of radiation by any atom

d)

patterns of emission and absorption by hydrogen ions.

e)

quantum (corpuscular) nature of light absorption by a hydrogen atom

23.

Properties of laser radiation (specify incorrect answer):

a)

lasers are the most powerful light sources

b)

laser radiation is induced radiation

c)

laser beam has a very small divergence angle

d)

the laser light is extremely monochromatic

e)

laser radiation is spontaneous (spontaneous) radiation

24.

The instruments for recording elementary particles are (specify incorrect answer):

a)

Geiger-Mueller counter

b)

thick layer photoemulsion.

c)

bubble chamber

d)

Wilson chamber

e)

a diffraction grating

25.

a- particles are:

a)

electrons

b)

positrons

c)

neutrons.

d)

helium nuclei

e)

protons

26.

Nuclei consist of:

a)

protons only

b)

of protons and electrons

c)

of electrons and positrons.

d)

from -particles

e)

of protons and neutrons

27.

State the number of protons and neutrons in the nucleus 17/8 O :

a)

Z=9; N=8

b)

Z=8; N=8.

c)

Z=17; N=8

d)

Z=8; N=9

e)

Z=8; N=17

28.

In nuclear reactions, the laws of conservation are fulfilled (indicate wrong answer):

a)

law of conservation of spin

b)

law of conservation of mass

c)

the laws of conservation are not satisfied

d)

law of conservation of charge

e)

law of conservation of energy

29.

Mass of the nucleus:

a)

it may be different

b)

less than the sum of the masses of protons and neutrons

c)

it is impossible to answer this question unambiguously.

d)

is equal to sum of protons and neutrons masses

e)

is greater than the sum of weights of protons and neutrons

30.

The fission reaction of uranium nuclei can become a chain reaction due to:

a)

emission of huge energy

b)

always a chain reaction.

c)

formation of fragments

d)

emission of protons in fission

e)

emission of neutrons during fission

31.

The multiplication factor in uranium fission is determined by the following factors: 1) capture of slow neutrons; 2) capture of neutrons by uranium nuclei without fission; 3) capture of neutrons by fission products, moderator; 4) escape of neutrons from the fissile material to the outside:

a)

factor 4 is enough.

b)

it is necessary to take into account factors 1 and 2

c)

factors 1, 2 and 3 must be considered

d)

it is necessary to consider factors 1, 2, 3, 4

e)

factor 1 is sufficient.

32.

Thermonuclear reactions are:

a)

neutron capture reactions.

b)

fusion reactions at any temperature

c)

fusion reactions of light nuclei at very high temperature

d)

reactions of the interaction of two nuclei if the result is one

e)

a -particle capture reactions

33.

The nuclear reaction is produced (except for the helium nucleus):

a)

proton

b)

гамма- quantum.

c)

a-particle

d)

electron

e)

neutron

34.

Among the elementary particles there is a (specify wrong answer) group:

a)

baryons

b)

hyperons

c)

mesons

d)

а - particle

e)

leptons

35.

A material point is:

a)

big ball

b)

a body of regular shape.

c)

a body whose dimensions can be neglected under the conditions of this problem or has a spherical shape

d)

very small body

e)

small ball

36.

A bullet with a mass of 10 g flies out of the rifle at a velocity of 600 m/s. Determine the average pressure force of the powder gases if the bullet moves inside the barrel for 0.05 s.

a)

0,12N

b)

12000N

c)

1.2N

d)

12N

e)

120N

37.

A wagon with a mass of 5t moves at a speed of 4m/s. Under the action of some force, its speed will increase to 9m/s, and the car travels a distance of 65m. What is the magnitude of the force acting on it?

a)

250N

b)

2000N

c)

25000N

d)

25N

e)

2500N

38.

A passenger train weighing 500 tons moves equally slow when braking; at the same time its speed in 20 seconds decreased from 54 km/h to 36 km/h. Find the braking force. Give the answer in kilonewtons.

a)

250

b)

1250

c)

2500

d)

12.5

e)

125

39.

At what initial velocity does a car with a mass of 3t move if it stops at a distance of 50m under the braking force of 3kN?

a)

54kph

b)

9 m/s

c)

15 m/s

d)

10m/s

e)

18 km/h

40.

Two weightless springs were connected in series and stretched. The elongation of the 100N/m spring was 2cm. Find in centimeters the deformation of the other spring with a stiffness of 500N/m.

a)

0.2 cm

b)

0.1cm

c)

4cm

d)

10 cm

e)

0.4cm

41.

Calculate the acceleration of free fall at a distance from the center of the earth that is twice its radius.

a)

0.25

b)

2

c)

1

d)

1,5

e)

2,5

42.

A body of mass 0.4kg is pulled uniformly along a horizontal surface by a spring parallel to the surface. Find the stiffness of the spring if it stretches 0.008m. The coefficient of friction is 0.4.

a)

600N/m

b)

2000N/m

c)

20N/m

d)

800N/m

e)

200N/m

43.

Two bodies with masses of 1 and 3 kg are connected by a thread thrown over a block suspended from a dynamometer. Determine the reading of the dynamometer when the bodies move. Neglect the friction in the block and its mass.

a)

40H

b)

20N

c)

80N

d)

30N

e)

60N

44.

A pendulum has a weight of 0.2 kg and a length of string of 1 m. When the string forms an angle of 60° with the vertical, the velocity of the weight is 1m/s. Determine the modulus of the force of tension of the thread at this moment

a)

1,6N

b)

1,2N

c)

1.8N

d)

1,4N

e)

1N

45.

A body of mass 2 kg was moving along a circle, and at some point it had a velocity of 4m/s, and when it passed a quarter of the circle, the magnitude of the velocity decreased to 3m/s. Determine the modulus of the vector of change in momentum of the body.

a)

8

b)

10

c)

12

d)

14

e)

6

46.

The number of gas molecules per unit volume decreased by a factor of 2.5. How many degrees did this heat the gas if its pressure did not change? The initial temperature of the gas is 300 K.

a)

550 K

b)

450 K

c)

650 K

d)

4500 K

e)

451 K

47.

Two identical metal balls are charged so that one is 5 times the charge of the other. The balls were brought into contact and moved apart to the same distance. How many times has the interaction force increased if the balls were charged with the same charge?

a)

2,5

b)

1.8

c)

8,1

d)

1,7

e)

2,8

48.

Two identical balls with charges of 4 µKL each are suspended at the same height at some distance from each other. What charge must be placed between the balls at the same distance from them so that the threads hang vertically?

a)

0,1 mKl

b)

-2 mCL

c)

0,3 mCL

d)

2 mCL

e)

-1 µKL

49.

The field strength created by a point electric charge is 10V/m at a distance of 1m from the charge. At what distance from the charge is the electric field strength equal to 1 kV/m?

a)

0,4 m

b)

2 m

c)

0,3 m

d)

0,1 m

e)

0,2 m

50.

What work does a homogeneous electric field of 200 V/m do when a 4 µCL charge moves 4 cm in the opposite direction to the direction of the field lines?

a)

-0.06 μJ

b)

5,04 uJ

c)

5,08 mcJ

d)

3,05 uJ

e)

32 μJ

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