UHS MDCAT Past Paper 2022

181- The work function for a metal is 4 eV. To emit a photo-electron of zero velocity from the surface of the metal the wavelength of incident light should be:

A. 2700 Å
B. 1700 Å
C. 5900 Å
D. 3100 Å

Answer : D. 3100 Å

182- The minimum energy required to remove an electron from the metal surface is called:

A. stopping potential
B. work function
C. threshold energy
D. both b and c

Answer : D. both b and c

183- The maximum kinetic energy of photoelectrons depends upon:

A. frequency of incident light
B. intensity of incident light
C. nature of cathode surface
D. both a and c

Answer : D. both a and c

184- The de Broglie wavelength of a particle of mass m and charge q accelerated from rest through a potential difference V is:

A. λ = h / √(2mqV)
B. λ = h / √(2mqv)
C. λ = h / √(2mq)
D. λ = h / √(2mV)

Answer : A. λ = h / √(2mqV)

185- The energy of a photon of wavelength λ is:

A. hc/λ
B. hλ/c
C. cλ/h
D. hcλ

Answer : A. hc/λ

186- The half-life of a radioactive element is 10 days. What is the fraction of the initial number of atoms left after 30 days?

A. 1/2
B. 1/4
C. 1/8
D. 1/16

Answer : C. 1/8

187- The half-life of a radioactive sample is 1 hour. What fraction of the sample will be left undecayed after 2 hours?

A. 1/2
B. 1/4
C. 1/8
D. 1/16

Answer : B. 1/4

188- The process in which a heavy nucleus splits into two nuclei of nearly equal mass is called:

A. radioactivity
B. nuclear fission
C. nuclear fusion
D. chain reaction

Answer : B. nuclear fission

189- The process in which two or more light nuclei combine to form a heavier nucleus is called:

A. radioactivity
B. chain reaction
C. nuclear fusion
D. nuclear fission

Answer : C. nuclear fusion

190- The binding energy per nucleon is maximum for the nucleus of:

A. Iron
B. Uranium
C. Hydrogen
D. Helium

Answer : A. Iron

191- Choose the word that is most nearly similar in meaning to the word in capital letters: **FORTITUDE**

A. Courage
B. Cowardice
C. Fear
D. Strength

Answer : A. Courage

192- Choose the word that is most nearly opposite in meaning to the word in capital letters: **ADVERSITY**

A. Distress
B. Misfortune
C. Calamity
D. Prosperity

Answer : D. Prosperity

193- Choose the correct sentence:

A. He is senior than me
B. He is senior to me
C. He is senior from me
D. He is senior of me

Answer : B. He is senior to me

194- Choose the correct sentence:

A. She is taller than I
B. She is taller than me
C. She is taller to I
D. She is taller from me

Answer : A. She is taller than I

195- Choose the correct sentence:

A. I prefer tea than coffee
B. I prefer tea to coffee
C. I prefer tea from coffee
D. I prefer tea over coffee

Answer : B. I prefer tea to coffee

196- Choose the correct sentence:

A. He is addicted to smoke
B. He is addicted to smoking
C. He is addicted in smoking
D. He is addicted at smoking

Answer : B. He is addicted to smoking

197- Choose the correct sentence:

A. She is good in English
B. She is good at English
C. She is good for English
D. She is good on English

Answer : B. She is good at English

198- Choose the correct sentence:

A. The train is running on time
B. The train is running in time
C. The train is running at time
D. The train is running by time

Answer : A. The train is running on time

199- Choose the correct sentence:

A. He died from cancer
B. He died of cancer
C. He died by cancer
D. He died with cancer

Answer : B. He died of cancer

200- Choose the correct sentence:

A. She is afraid from dogs
B. She is afraid of dogs
C. She is afraid by dogs
D. She is afraid at dogs

Answer : B. She is afraid of dogs

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