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- Question
Why does water tank appear shallower when viewed from the top?
Options- A. Due to reflection
- B. Due to refraction
- C. Due to diffraction
- D. Due to total internal reflection
- Correct Answer
- Due to refraction
- 1. Which of the following is a characteristic of an exothermic reaction?
Options- A. Release of heat
- B. Absorption of heat
- C. Doesn't involve any change in temperature
- D. None of the option is correct Discuss
- 2. Which one of the following is not a property of electromagnetic waves?
Options- A. Electromagnetic waves do not show interference and diffraction.
- B. Oscillating electric field and magnetic field are perpendicular to each other.
- C. Electromagnetic waves are transverse waves
- D. Electromagnetic waves do not require a medium to propagate. Discuss
- 3. It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?
Options- A. Law of inertia
- B. Newton's second law
- C. Newton's third law
- D. Pascal's law Discuss
- 4. The group of solar cells joined together in a definite pattern is called a
Options- A. Battery
- B. Solar Heater
- C. Solar cooker
- D. Solar cell panel Discuss
- 5. The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with
Options- A. Pascal?s law
- B. Newton?s law
- C. Bernoulli?s principle
- D. Archimedes? principle Discuss
- 6. What is the SI unit of temperature?
Options- A. Kelvin
- B. Joule
- C. Celsius
- D. Fahrenheit Discuss
- 7. When a piece of pure silicon is doped with aluminium, then
Options- A. the conductivity of the doped silicon piece will remain the same
- B. the doped silicon piece will become n-type
- C. the doped silicon piece will become p-type
- D. the resistivity of the doped silicon piece will increase Discuss
- 8. Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be
Options- A. P
- B. 3P
- C. p/3
- D. 2p/ 3 Discuss
- 9. A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become
Options- A. C
- B. C/7
- C. 7C
- D. 14C Discuss
- 10. For which one of the following does the centre of mass lie outside the body?
Options- A. A fountain pen
- B. A cricket ball
- C. A ring
- D. A book Discuss
Physics problems
Search Results
Correct Answer: Release of heat
Correct Answer: Electromagnetic waves do not show interference and diffraction.
Correct Answer: Newton's third law
Correct Answer: Solar cell panel
Correct Answer: Pascal?s law
Explanation:
Pascal's law is a principle in fluid mechanics that states that a pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere.
This principle is stated mathematically as: P= P + rgh
Correct Answer: Kelvin
Correct Answer: the doped silicon piece will become p-type
Explanation:
p type of semiconductor is obtained when Silicon is doped with a trivalent impurity like Aluminium. Aluminium is a p-type dopant, which means that when a semiconductor i.e. silicon is doped with aluminium, it creates a hole (positively charged carrier) by accepting an electron from the silicon atom. Electrical conductivity of semiconductors increasesand resistivity remains the same
Correct Answer: 3P
Explanation:
P= I^2.R where, I= Current, P= Electric Power, R=Resistance. Here all the resistance is put in parallel combination and in parallel combination the value of Resistance decreases and dissipation of power increase, hence 3 times more power will be dissipated(3P).
Correct Answer: 7C
Explanation:
As the capacitance is charged by the factor equal to the value of dielectric constant, Hence, C? = kC = 7C
Correct Answer: A ring
Explanation:
For balancing the weight of ring, you need to put your finger or any solid object inside the ring so that you will be able to sustain their own weight because they are not able to sustain their own weight.so its centre of mass lies outside the body.
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