Physics

Question 1

1A nuclear reactor uses control rods made of

Medium

A. copper B. gold C. iron D. boron or cadmium to absorb neutrons

Question 2

2X-rays are used in hospitals mainly to

Easy

A. cool patients B. measure blood pressure C. take images of bones D. sterilise water

Question 3

3Einstein's equation E = mc² shows that

Easy

A. light has mass B. energy has no mass C. speed equals mass D. mass can be converted into energy

Question 4

4The maximum energy of X-ray photons from a tube at 50 kV is

Hard

A. 50 eV B. 50 keV C. 5 keV D. 500 keV

Question 5

5Splitting a heavy nucleus into lighter nuclei is

Easy

A. nuclear fusion B. nuclear fission C. ionisation D. radioactive decay only

Question 6

6Hard X-rays differ from soft X-rays because they have

Hard

A. higher energy and greater penetration B. longer wavelength C. lower frequency D. no charge

Question 7

7Einstein's mass–energy equation is

Easy

A. E = mgh B. E = mc² C. E = ½mv² D. E = hf only

Question 8

8X-rays are used in hospitals because they

Easy

A. are visible light B. pass through soft tissue but are absorbed by bone C. kill all germs D. heat the body

Question 9

9The energy released when 0.001 kg of mass is converted entirely is (c = 3 × 10⁸ m/s)

Hard

A. 9 × 10¹³ J B. 3 × 10⁵ J C. 3 × 10¹¹ J D. 9 × 10¹⁶ J

Question 10

10Splitting a heavy nucleus, such as uranium-235, into smaller nuclei is

Easy

A. radioactive decay only B. ionisation C. nuclear fission D. nuclear fusion