Physics problems
- 1. The speed of light will be minimum while passing through
Options- A. water
- B. vaccum
- C. air
- D. glass Discuss
Correct Answer: glass
- 2. Nuclear sizes are expressed in a unit named
Options- A. Fermi
- B. Angstrom
- C. Newton
- D. Tesla Discuss
Correct Answer: Fermi
Explanation:
Nuclear sizes are expressed in a unit called "Fermi" which is a unit of length equal to 10?15 metre (one femtometre), used in nuclear physics. It is similar to the diameter of a proton.
- 3. The most suitable unit for expressing nuclear radius is
Options- A. micro
- B. nanometre
- C. fermi
- D. angstrom Discuss
Correct Answer: fermi
- 4. Temperature can be expressed as derived quantity in terms of any of the following
Options- A. length and mass
- B. mass and time
- C. length,mass and time
- D. in terms of none Discuss
Correct Answer: in terms of none
- 5. Which of the following is not a vector quantity?
Options- A. speed
- B. velocity
- C. torque
- D. displacement Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: speed
- 6. Which of the following is not the unit of time
Options- A. Parallactic second
- B. Micro Second
- C. Leap year
- D. Solar day Discuss
Correct Answer: Parallactic second
- 7. Two electric bulbs marked 25W ? 220V and 100W ? 220V are connected in series to a 440Vsupply. Which of the bulbs will fuse?
Options- A. 25 W
- B. Both
- C. 100 W
- D. Neither Also asked in: AIEEE
Correct Answer: 25 W
Explanation:
Resistances of both the bulbs are
R1=V^2/P1 = 220^2/25
R2 = V^2/P2 = 220^2/100
Hence
When connected in series, the voltages divide in them in the ratio of their resistances. The voltage of 440 V devides in such a way that voltage across 25 w bulb will be more than 220 V. Hence 25 w bulb will fuse.
- 8. An air bubble in water will act like a
Options- A. convex lens
- B. convex mirror
- C. concave lens
- D. concave mirror Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: concave lens
- 9. If a sound travels from air to water, the quantity that remain unchanged is
Options- A. velocity
- B. frequency
- C. wavelength
- D. amplitude Discuss
Correct Answer: frequency
- 10. Rain drops acquire spherical shape due to
Options- A. viscosity
- B. surface tension
- C. friction
- D. elasticity Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: surface tension
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