Objective physics only 5 minutes test.

1. SI unit of electric current is: A) Volt B) Ampere C) Ohm D) Watt Correct Answer: B) Ampere
2. The resistance of a conductor depends directly on: A) Area of cross-section B) Length of the conductor C) Density of the material D) Shape of the conductor Correct Answer: B) Length of the conductor
3. Focal length of a plane mirror is: A) Zero B) Positive C) Negative D) Infinity Correct Answer: D) Infinity
4. The device used to measure electric current in a circuit is: A) Voltmeter B) Galvanometer C) Ammeter D) Rheostat Correct Answer: C) Ammeter
5. The bending of light when it passes from one medium to another obliquely is called: A) Reflection B) Refraction C) Dispersion D) Scattering Correct Answer: B) Refraction
6. The power of a lens of focal length +2\text{ m} is: A) +0.5\text{ D} B) -0.5\text{ D} C) +2.0\text{ D} D) -2.0\text{ D} Correct Answer: A) +0.5\text{ D}
7. The part of the human eye that controls the amount of light entering is the: A) Retina B) Cornea C) Pupil D) Iris Correct Answer: C) Pupil
8. Joule's law of heating is given by the formula: A) H = VIt B) H = I^{2}Rt C) H = \frac{V^{2}}{R}t D) All of the above Correct Answer: D) All of the above
9. The magnetic field lines inside a long current-carrying straight solenoid are: A) Circular and close to each other B) Parallel straight lines C) Elliptical in shape D) Intersecting at the center Correct Answer: B) Parallel straight lines
10. A concave mirror gives a virtual, erect, and magnified image of an object when the object is placed: A) At infinity B) Between Pole and Focus C) At the Center of Curvature D) Beyond the Center of Curvature Correct Answer: B) Between Pole and Focus
11. The commercial unit of electrical energy is: A) Watt B) Kilowatt C) Kilowatt-hour D) Joule Correct Answer: C) Kilowatt-hour
12. The blue color of the clear sky is due to: A) Reflection of light B) Refraction of light C) Dispersion of light D) Scattering of light Correct Answer: D) Scattering of light
13. The resistance of a wire of length L and cross-sectional area A is R. If its length is doubled, its new resistance will be: A) R/2 B) R C) 2R D) 4R Correct Answer: C) 2R
14. The defect of vision in which a person can see distant objects clearly but cannot see nearby objects clearly is: A) Myopia B) Hypermetropia C) Presbyopia D) Astigmatism Correct Answer: B) Hypermetropia
15. Direction of magnetic field lines outside a bar magnet is always: A) From South pole to North pole B) From North pole to South pole C) Towards the center from all directions D) Random Correct Answer: B) From North pole to South pole
16. Which of the following represents Ohm's Law? A) V = IR B) I = VR C) R = VI D) V = I/R Correct Answer: A) V = IR
17. The splitting of white light into its component colors on passing through a glass prism is called: A) Reflection B) Refraction C) Dispersion D) Scattering Correct Answer: C) Dispersion
18. In a household circuit, appliances are always connected in: A) Series combination B) Parallel combination C) Mixed combination D) Direct short circuit Correct Answer: B) Parallel combination
19. The least distance of distinct vision for a normal human eye is about: A) 25\text{ cm} B) 25\text{ m} C) infinity D) 2.5\text{ cm} Correct Answer: A) 25\text{ cm}
20. The SI unit of electric power is: A) Joule B) Coulomb C) Watt D) Volt Correct Answer: C) Watt