## JUPEB: PHYSICS

#### Quizzes

- physics jupeb
- JUPEB 2015: PHYSICS – SCI-J155 – Multiple Choice Questions
- JUPEB 2015: PHYSICS – Essay Questions
- JUPEB 2016: PHYSICS: SCI-J155 – Multiple Choice Questions
- JUPEB 2016: PHYSICS – Essay Questions
- JUPEB 2016 PHYSICS: SCI-J155 – Multiple Choice Questions
- JUPEB 2019: PHYSICS – Multiple Choice Questions
- JUPEB 2019: PHYSICS – Essay Questions

#### Participants 7190

## Do you like this content?

## Follow us

#### Quiz Summary

0 of 8 Questions completed

Questions:

#### Information

You have already completed the quiz before. Hence you can not start it again.

Quiz is loading…

You must sign in or sign up to start the quiz.

You must first complete the following:

#### Results

#### Results

0 of 8 Questions answered correctly

Your time:

Time has elapsed

You have reached 0 of 0 point(s), (0)

Earned Point(s): 0 of 0, (0)

0 Essay(s) Pending (Possible Point(s): 0)

#### Categories

- Not categorized 0%

- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8

- Current
- Review
- Answered
- Correct
- Incorrect

- Question 1 of 8
##### 1. Question

(a) Define the following terms and give their units.

(i)Work

(ii) Power

(b) A copper wire LM is fused at the end M to an iron wire MN. The copper wire has length 0.9m and cross-sectional area of 0.9 x 10

^{s}m^{2}. The iron wire has length 1.4m and cross-sectional 1.3 x 10″^{6}m^{2}. When^{1}the compound wire is stretched by the same force, its total length increased by 0.01 m, calculate:(i) The ratio of the extensions of the two wires

(ii) The extension of each wireÂ Â Â(iii) The tension applied to the compound wire. [Young Moduli for copper and iron are 1.3 x 10

^{11}N/m^{2}and 2.1 x 10″ N/m^{2}respectively](c) i. State Newton’s law of gravitation

ii. What is gravitational field strength?

iii. At the surface of the earth g = 9.806ms”

^{2}m assuming the earth to be a sphere of radius 6.731 x 10^{6}m. Compute the mass of the earth. Gravitational constant = 6.67 x10^{11}Nm^{2}.This response will be reviewed and graded after submission.

Grading can be reviewed and adjusted.Grading can be reviewed and adjusted. - Question 2 of 8
##### 2. Question

(a)i. Clearly distinguish between the properties: mass and weight of a body.

ii. State Keppler’s laws of planetary motion.

(b) A satellite of mass 66 kg is in orbit round the earth at a distance of 5.7 R above its surface, where R is the value of the mean radius of the earth. If the gravitational force of the earth at 9.8 N/kg. Calculate:

I. the centripetal force acting on the satellite

ii. The period of the satellite in the orbit in hours.

(c)i. State the law of conservation of energy.

ii. A boy exerts a force of 12.ON at an angle of 30Â° above the horizontal on a 6.40kg roller. Find the work done by the boy and the final speed of the roller after it moves 2.00m, assuming the roller starts with an initial speed of 0.50,0m/s and slides horizontally without friction.

This response will be reviewed and graded after submission.

Grading can be reviewed and adjusted.Grading can be reviewed and adjusted. - Question 3 of 8
##### 3. Question

(a) i. Explain with the aid of a well-labeled diagram, the term amplitude and wavelength of a wave.

ii. State the conditions for the phenomenon of total internal reflection in communications.

(b) A Carnot engine operates between the temperature T

_{0}= 850K and T, = 300K. The engine performs 1200J of work each cycle, which takes0.25s(i) What is the efficiency of this engine?

(ii) What is the average power of this engine?

(iii) How much energy is extracted as heat from the high-temperature reservoir every cycle?

(iv) How much energy is delivered as heat to the low-temperature reservoir?

This response will be reviewed and graded after submission.

Grading can be reviewed and adjusted.Grading can be reviewed and adjusted. - Question 4 of 8
##### 4. Question

(a) How can myopia be corrected?

(b) The equation for a transverse wave moving along string is y = 60 sin (0.020x + 4.0t), where x and y are in cm and t is second. Determine the wave’s

(i) Amplitude

(ii) Speed

(iii) Direction of Propagation

(iv) Maximum transverse speed for a particle on the string

(c) An object is placed 6cm from a converging lens with a focal length of 4cm i. Calculate the position of the image, ii. Calculate the magnification of the lens, iii. Identify three properties of the image.

This response will be reviewed and graded after submission.

Grading can be reviewed and adjusted.Grading can be reviewed and adjusted. - Question 5 of 8
##### 5. Question

(a)i. Differentiate between Ohmic and non-ohmic materials

ii. What are the quantities that the resistance of a wire depends on?

(b) A heating coil of power rating 10 W is required when the p.d. across it is 20V. Calculate the length of nichrome wire needed to make the coil if the cross-sectional area of the wire used is 1.0

^{-7}x 10^{2}m and resistivity of nichrome is 1.0 x 10^{6}.(c) An alternating current with a peak value of 6.8A flows through a series R-L-C circuit. If the values of the resistance, inductance and capacitance are 50, 0.2H and 40 respectively and the frequency of the generator is 60Hz, calculate;

(i) The peak value of the applied voltage.

(ii) The average power dissipated in the circuit.

(iii) The Phase angle.

This response will be reviewed and graded after submission.

Grading can be reviewed and adjusted.Grading can be reviewed and adjusted. - Question 6 of 8
##### 6. Question

(a) Explain the concept of Doppler effect.

(b) In the figure below, X is a small positively charged sphere with a mass of 20kg. It is suspended from the roof by an insulating rope which makes an angle of 30Â° with the roof. Y is a small negatively charged sphere which has the same magnitude of charge as X. Y is fixed to the wall by means of an insulating bracket. Assuming the system is in equilibrium, what is the magnitude of the charge on X?

(c) Two parallel conducting plates, each of area 0.30m, are separated by a distance of 2.0 x 10″

^{2}m.i. What direction will the line of force travel?

ii. Calculate the capacitance.

iii. Calculate the electrostatic force.

iv. Calculate the acceleration produced by the electrostatic force.

This response will be reviewed and graded after submission.

Grading can be reviewed and adjusted.Grading can be reviewed and adjusted. - Question 7 of 8
##### 7. Question

(a) Explain the terms

(i) length contraction

(ii) time dilation(b) Explain why it is not possible to accelerate an object to move at the speed of light.

(c) In the frame of reference in which a particle called the muon, it has a lifetime of 2.2. What is the lifetime of the muon as measured by a scientist that observes the muon moving with speed.

(d) An electron and positron have the same rest mass (9.1 x 10

^{-34}) When both collide they annihilate to give two photons of equal energy. Calculate the energy, of each photon assuming both initial particles have zero kinetic energy.(e) An observer reports an event to occur at position x = 50m and time, t. A second observer moves at velocity v = 0.6c along the x-axis. Calculate using Lorentz transformation, the x-coordinate of the event as measured by the second observer.

This response will be reviewed and graded after submission.

Grading can be reviewed and adjusted.Grading can be reviewed and adjusted. - Question 8 of 8
##### 8. Question

(a) i. What is the meaning of the acronym LASER?

ii. Explain each of the following terms as related to LASER spontaneous emission and stimulated emission.

(b) 1. Â What is nuclear transmutation?

ii. Show that the amount of a radioactive nucleus after time t. is N

_{(t)}=*K*where N is the number of nuclei at time t = 0, wavelength is the decay constant.^{u}(iii) When a uranium – 235 captures a slow neutron it may undergo the following fission.

10nÂ +Â 23592UÂ â†’23692Uâ†’14156BaÂ +Â abXÂ +310n

Determine the mass number and atomic of nuclei X Determine the energy it releases.

This response will be reviewed and graded after submission.

Grading can be reviewed and adjusted.Grading can be reviewed and adjusted.

## Responses