Discussion
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- Question
Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth _______.
Options- A. remains same
- B. becomes half
- C. becomes twice
- D. becomes one-fourth
- Correct Answer
- becomes one-fourth
- 1. What are the two kinds of Rotatory motion?
Options- A. Spin and Vibrational motion
- B. Spin and Projectile motion
- C. Spin and Orbital motion
- D. Spin and Translatory motion Discuss
- 2. Find the resistance (in mega ?) of a wire of length 8 m, cross sectional area 2 sq.cm and made of a material of resistivity 120 ?m.
Options- A. 1920
- B. 4.8
- C. 2.4
- D. 960 Discuss
- 3. Sudden fall in the barometric reading is an indication of _______.
Options- A. Storm
- B. Scorching heat
- C. Rain
- D. Clear weather Discuss
- 4. What is the SI unit of pressure?
Options- A. Newton
- B. Weber
- C. Pascal
- D. Henry Discuss
- 5. _______ optical data storage is a technology where data is stored in multiple layers in the optical disc.
Options- A. 3D
- B. 30D
- C. 300D
- D. 3000D Discuss
- 6. How can we measure specific gravity of milk?
Options- A. Using a viscometer
- B. Using an odometer
- C. Using a hygrometer
- D. Using a hydrometer Discuss
- 7. Which is a common first indicator of an approaching thunderstorm?
Options- A. too hot
- B. heavy wind
- C. a buildup of dark clouds
- D. lightning Discuss
- 8. What color does blue and yellow make?
Options- A. Green
- B. Black
- C. Red
- D. White Discuss
- 9. What kind of crystalline solid is graphite?
Options- A. Metallic
- B. Ionic
- C. Molecular
- D. Covalent- network Discuss
- 10. Parasec is ythe unit of
Options- A. distance
- B. time
- C. intensity of light
- D. magnetic line Discuss
Physics problems
Search Results
Correct Answer: Spin and Orbital motion
Correct Answer: 4.8
Correct Answer: Storm
Correct Answer: Pascal
Correct Answer: 3D
Correct Answer: Using a hydrometer
Correct Answer: a buildup of dark clouds
Explanation:
The first indicator of an approaching thunderstorm is a buildup of dark clouds.
A thunderstorm is a storm with lightning and thunder; it is usually produced by heavy rain, gusty wind, and the cumulonimbus cloud. The thunderstorm is made up of moisture, unstable air and lift.
Correct Answer: Green
Correct Answer: Covalent- network
Explanation:
Graphite is a covalent-network type of crystalline solid.
There are two main categories of solids.
1. Crystalline solids and
2. Amorphous solids.
Crystalline solids are those in which the atoms, ions, or molecules that make up the solid exist in a regular, well-defined arrangement.
There are four types of crystalline solids :
Ionic solids :? Made up of positive and negative ions and held together by electrostatic attractions. They?re characterized by very high melting points and brittleness and are poor conductors in the solid state. An example of an ionic solid is table salt, NaCl.
Molecular solids :? Made up of atoms or molecules held together by London dispersion forces, dipole-dipole forces, or hydrogen bonds. Characterized by low melting points and flexibility and are poor conductors. An example of a molecular solid is sucrose.
Covalent-network (also called atomic) solids :? Made up of atoms connected by covalent bonds; the intermolecular forces are covalent bonds as well. Characterized as being very hard with very high melting points and being poor conductors. Examples of this type of solid are diamond and graphite, and the fullerenes. As you can see below, graphite has only 2-D hexagonal structure and therefore is not hard like diamond. The sheets of graphite are held together by only weak London forces!
Metallic solids :? Made up of metal atoms that are held together by metallic bonds. Characterized by high melting points, can range from soft and malleable to very hard, and are good conductors of electricity.
Correct Answer: distance
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