Which one of the following pairs does not have the same dimension?

• Potential energy and kinetic energy

• Density and specific gravity

• Focal length and height

• Gravitational force and frictional force

Which one of the following graphs represents uniform motion?

How many sixty watts (60 W) bulbs may be safely used in a 240-V supply with a 4-ampere fuse?

• 4

• 8

• 12

• 16

A vessel contains oil (density ρ₁) over a liquid of density ρ₃; a homogeneous sphere of volume V floats with half of its volume immersed in the liquid and the other half in oil. The weight of the sphere is

• V (ρ₂ - ρ₁) / 2

• V (ρ₂ + ρ₁) g/ 2

• V (ρ₂ - ρ₁) / 2

• V (ρ₂ - ρ₁) / 2

For a simple pendulum is simple harmonic motion, which of the following statements is/are correct?

1. The kinetic energy is maximum at the mean position.
2. The potential energy is maximum at the mean position.
3. Acceleration is maximum at the mean position.

Select the correct answer using the code given below:

• 1 only

• 2 only

• 1 and 3

• 2 and 3

The metal atom, which is present in superphosphate, is

• sodium (Na)

• potassium (K)

• calcium (Ca)

• magnesium (Mg)

The best and the poorest conductors of heat are respectively

• silver (Ag) and lead (Pb)

• copper (Cu) and aluminium (Al)

• silver (Ag) and gold (Au)

• copper (Cu) and gold (Au)

Which one among the following metals is more reactive than hydrogen?

• Mercury

• Copper

• Silver

• Tin

The number of neutrons in ₁₃AF²⁷ is

• 40

• 27

• 14

• 13

Match the List I with List II, III, and IV.

List I (Elements)

1. Diamond
2. Graphite
3. Rayon
4. Nylon
5. Carbon fiber
6. Polyvinyl chloride
7. Terylene
8. Bakelite

List II (Property)

1. Thermosetting Polymer
2. Monomer
3. Soft
4. Viscose process
5. Synthetic fibre
6. High strength
7. Thermoplastic
8. Polyester fiber
9. Hardest Natural substance

List III (Property/Composition)

1. Rigid structure
2. Sheet-like structure
3. Cellulose
4. Soft on heating
5. Unreactive
6. Corrosion
7. Melts instead of burning
8. Ethylene glycol
9. Phenol and formaldehyde

List IV (Property/Composition)

1. Non-conductor of heat
2. Ester
3. Conductor of heat
4. Ether
5. Silk-like thread
6. Spacecraft
7. Chlorine atom replaces a hydrogen atom
8. Cross-linked
9. Terephthalic acid

• List I - (a)

  List II - 9

  List III - I

  List IV - i

• List I - (b)

  List II - 3

  List III - IV

  List IV - iv

• List I - (a)

  List II - 9

  List III - I

  List IV - ii

• List I - (b)

  List II - 3

  List III - II

  List IV - v