Metals are good conductors of electricity because

A) they contain free electrons
B) the atoms are lightly packed
C) they have high melting point
D) All of the above

---

View Answer

Light year is a unit of

A) time
B) distance
C) light
D) intensity of light

---

View Answer

Stars appears to move from east to west because

A) all stars move from east to west
B) the earth rotates from west to east
C) the earth rotates from east to west
D) the background of the stars moves from west to east

---

View Answer

Sound waves in air are

A) transverse
B) longitudinal
C) electromagnetic
D) polarised

---

View Answer

Rectifiers are used to convert

A) Direct current to Alternating current
B) Alternating current to Direct current
C) high voltage to low voltage
D) low voltage to high voltage

---

View Answer