Physics Past Questions And Answers
What is the total electrical energy consumed by using an electric cooker rated 1000W for 5 hrs?
- A. 5.3 x 103J
- B. 6.5 X 103J
- C. 1.8 X 107J
- D. 2.3 X 107J
I. It is a rapid, constant and irregular motion of tiny particles. II. It gives evidence that tiny particles of matter called molecules exist. III. It takes place only in gases. IV. It gives evidence that molecules are in a constant state of random motion. which of the combinations above is correct about Brownian notion?
- A. I,II and III only
- B. II,III and IV only
- C. I,III and lV only
- D. l, ll and lV only
Increase in farm produce is not usually improved by the Improved sales of crop and livestock does not increase farm produce.
- A. use of improved crop varieties
- B. Increased use of manure and fertilizer
- C. Improved sales of crop and livestock
- D. Use of better farm equipment and tools
What force has to be exerted on a mass 60kg to give it an acceleration of 10ms-2 vertically upwards? [g = 10ms-2
- A. 300N
- B. 600N
- C. 1200N
- D. 400N
The unit of inductance is
- A. farad
- B. henry
- C. hertz
- D. weber
Which of the following processes is not a surface phenomenon?
- A. Condensation
- B. Evaporation
- C. Photo Emission
- D. Thermionic Emission
If the frequency of the e.m.f. source in the a.c. circuit illustrated below is \(\frac{500}{\pi}\)Hz. What is the reactance of the inductor?
- A. 450
- B. 0.9
- C. 900
- D. 567
A conductor of length 2m carries a current of 0.8A while kept in a magnetic field of magnetic flux density 0.5T. The maximum force acting on it is
- A. 0.2N
- B. 0.8N
- C. 3.2N
- D. 8.0N
At what position will an object be placed in front of a concave mirror in order to obtain an image at infinity?
- A. At the pole of the mirror
- B. At the principal focus
- C. at the center of the curvature
- D. Between the principal focus and the center of curvature
The images formed by a diverging lens are always
- A. diminished, virtual and inverted
- B. diminished inverted and real
- C. diminished, virtual and erect
- D. magnified, virtual and erect