Physics Toughest Trivia Exam: Quiz!
50 Questions
| Total Attempts: 42
(197).jpg "Physics Toughest Trivia Exam: Quiz!")
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Questions and Answers
- 1.Rockets were first used as
- A.
Ceremonial fireworks
- B.
A form of transportation
- C.
Instruments of war
- D.
Hunting tools
- 2.Which one of the following is not one of the three distinct elements that work together to make satellite (SATCOM) possible?
- A.
Payload segment
- B.
Control segment
- C.
Ground control
- D.
Space segment
- 3.Which one of the following is not a function of the (SATCOM) control segment?
- A.
Ground control
- B.
Payload control
- C.
Network control
- D.
Spacecraft control
- 4.Which of the following is/are semiconductor(s)?
- A.
Silicon
- B.
Copper
- C.
Iron
- D.
Germanium
- 5.Which one of the following phenomena is called the photoelectric effect?
- A.
High energy electrons impinge on a metallic anode which then emits photons.
- B.
A high energy photon emits photons as it is slowed down.
- C.
A metal absorbs quanta of light and then emits electrons.
- D.
Two electrons are created from a quantum of light.
- 6.Which of the following statement about X-rays is/are correct?
- A.
X-rays do not consist of electrically charged particles.
- B.
X-rays has the same frequency with radio waves.
- C.
X-rays are not deflected in an electric or magnetic field.
- D.
The wave length of X-rays is longer than that of light.
- 7.The phenomenon of radioactivity was first discovered by:
- A.
Marie Curie
- B.
Sir J.J. Thompson
- C.
Neils Bohr
- D.
Henri Becquerel
- 8.Two radioactive elements P and Q have half-lives of 10 and 20 minutes respectively. If they started off with the same number of atoms, what is the ratio of the number of remaining atoms of P to that of Q after 80 minutes?
- A.
8:1
- B.
1:16
- C.
16:1
- D.
1:8
- 9.Which of the following names is not associated with models of the atom?
- A.
Isaac Newton
- B.
Sir J.J. Thompson
- C.
Neils Bohr
- D.
Ernest Rutherford
- 10.What is the peak value of an A.C. voltage whose r.m.s value is 100V?
- A.
140.00V
- B.
50.00V
- C.
70.70V
- D.
141.42V
- 11.A transformer with 5500 turns in its primary is used between a 240V A.C. supply and a 120V kettle. Calculate the number of turns in the secondary.
- A.
460
- B.
11000
- C.
2750
- D.
232
- 12.The dimension of power is
- A.
ML2T-3
- B.
MLT-2
- C.
ML2T-2
- D.
ML-2T-3
- 13.Two points on a velocity-time graph have coordinates (5s, 10ms-1) and (20s, 20ms-1). Calculate the mean acceleration between the two points
- A.
2.00ms-2
- B.
0.83ms-2
- C.
0.67ms-2
- D.
1.50ms-2
- 14.An object is projected with a velocity of 100m/s from the ground level at an angle Ɵ to the vertical. If the total time of flight of the projectile is 10s, calculate Ɵ. (g = 10m/s2)
- A.
550
- B.
450
- C.
300
- D.
600
- 15.An object of mass 5kg moves around a circle of radius 6m. If the period of the motion is πs, calculate the force towards the center.
- A.
75N
- B.
100N
- C.
120N
- D.
50N
- 16.A force of 20N applied parallel to the surface of a horizontal table is just sufficient to make a block of mass 4kg move on the table. Calculate the coefficient of friction between the block and the table [g = 10m/s2].
- A.
1.0
- B.
0.5
- C.
2.0
- D.
20.0
- 17.A simple pendulum has a period of 17.0s. when the length is shortened by 1.5m, its period is 8.5s. Calculate the original length of the pendulum.
- A.
2.0m
- B.
3.0m
- C.
4.0m
- D.
6.5m
- 18.A constant force of magnitude F acts on an object of mass 0.04kg initially at rest at a point O. If the speed of the object when it has moved 50m from O is 500ms-1, what is the value of F?
- A.
100N
- B.
10N
- C.
1000N
- D.
55N
- 19.A girl whose mass is 20kg climbs up 25 steps, each of height 15cm in 10 seconds. Calculate the power expended [g = 10m/s2]
- A.
7500W
- B.
750W
- C.
7.5W
- D.
75W
- 20.Two objects of masses 80kg and 50kg are separated by a distance of 0.2m. If the gravitational constant is 6.6x10-11Nm2kg-2, calculate the gravitational attraction between them.
- A.
6.6 x 10-6N
- B.
6.8 x 10-6N
- C.
6.1 x 10-6N
- D.
1.3 x 10-6N
- 21.A machine having a velocity ratio of 4 requires a weight of 20kg to overcome the weight of 60kg. The efficiency of the machine is
- A.
90%
- B.
60%
- C.
75%
- D.
331/3%
- 22.An object is heated from 300C to 570C. What is the increase in its temperature on the Kelvin scale?
- A.
27K
- B.
100K
- C.
18K
- D.
300K
- 23.The distance between the fixed points of a centigrade thermometer is 20cm. what is the temperature when the mercury level is 4.5cm above the lower mark?
- A.
100.00C
- B.
22.50C
- C.
29.00C
- D.
90.00C
- 24.Metal rods of length 20m each are laid end to form a bridge at 250C. What gap will be provided between consecutive rails for the bridge to withstand 750C? [Linear expansivity of the material = 2.0 x10-5K-1]
- A.
0.20m
- B.
0.02m
- C.
0.25m
- D.
0.22m
- 25.A tap supplies water at 250C while another supplies water at 750C. If a man wishes to bath with water at 400C, what is ration of the mass of hot water to that of cold water required?
- A.
3:7
- B.
1:3
- C.
3:1
- D.
15:8
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