please answer the MCQ question below.

1.How to reduce the equipment uncertainty?

Select one:

a. Use the precise apparatus

b. Increase the number of the trials

c. None of the answers is correct

d. Decrease the number of the trials

e. Increase the time of measurements

2. How to reduce the random error?

Select one:

a. Decrease the number of the trials

b. Increase the time of measurements

c. Increase the number of the trials

d. None of the answers is correct

e. Use the precise apparatus

3.You measure Speed as Distance over Time S=D/T. You know the absolute and relative errors of the distance and time measurements. How to evaluate the error of the speed?

Select one:

a. None of the answers is correct

b. Add the relative D and T errors

c. Substract the absolute D and T errors

d. Add the absolute D and T errors

e. Substract the relative D and T errors

10. If our sun were twice as massive, how might the earth's movement change?

Select one:

a. None of the answers is correct

b. The path would not change

c.

The Earth would definitely crash into the sun

d. The path would be smaller

e. The path would be bigger

12. What three properties of the nucleus can be deduced from the Rutherford scattering experiment?

Select one:

a. Big, massive and positive

b. Small, massive and negative

c. Small, massive and positive.

d. Big, light and negative

e. Small, light and positive

13. What would be the paths of the alpha particles in the Plum Pudding atom?

Select one:

a. All alpha particles undergo significant deflections

b. Most of the alpha particles pass through un-deflected , some rebound occur

c. All alpha particles pass through un-deflected

d. Most of the alpha particles pass through un-deflected, some undergo significant deflections

e. All alpha particles will rebound

14. An Alpha particle is a

Select one:

a. Helium atom

b. Hydrogen atom

c. Electron

d. Helium nuclei

e. Hydrogen nuclei

15. The same potential difference V is applied across two wires. Wire A carries twice the current I of wire B. If the resistance of wire B is R, what is the resistance of wire A?

Select one:

a. R

b. R/4

c. 2R

d. R/2

e. 4R

17. A particle in a medium is part of a wave motion. Its distance from the resting position at any particular time is called its

Select one:

a. Amplitude

b. Wavelength

c. Phase

d. Period

e. Displacement

19. A traveling wave passes a point of observation. At this point, the time between successive crests is 0.2 s. Which of the following statements can be justified?

Select one:

a. The velocity of propagation is 5 m/s

b. There is not enough information to justify any of these statements

c. The wavelength is 0.2 m

d. The wavelength is 5 m

e. The frequency is 5 Hz

20. As light passes from one medium into another, the angle of refraction is smaller in the medium with the _____ index of refraction and _____ speed of light.

Select one:

a. larger; higher

b. larger; lower

c. smaller; lower

d. none of the above

e. smaller; higher

22. If we observe a spectrum of the heating metal and find that the wavelenght of the peak power

Select one:

a. Doesn't change

b. Shifts to the smaller wavelength

c. Shifts to the bigger wavelength

d. None of the above

e. Shifts to the smaller frequencies

23. Which flame if the hottest

Select one:

a. None of the above

b. Having a blue color

c. Having a white color

d. Having a red color

e. The temperature of the flame doesn't depend on the color

24. If we look at Earth from space with an infra-red temperature probe to measure the amount of IR radiation emitted to space by the Earth, what temperature would we measure?

Select one:

a. 288

b. 298

c. 280

d. 250K

e. 255K

25. The eath emits radiation with greatest intensity at

Select one:

a. radio wavelengths

b. visible wavelengths

c. ultraviolet wavelengths

d. infrared wavelengths

e. Not emits any radiation