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| MDCAT Entry Test Preparation 2022 Online MCQs With Answers |
1- If two NOT gates in parallel are attached to the NAND gate in series, the gate formed is:
a) NOR
b) NAND
c) OR
d) XOR
2- AC voltage is fed into a single-diode rectifier. The output of the rectifier is:
a) Full-wave rectified DC voltage
b) Half wave rectified DC voltage
c) Double frequency AC voltage
d) Nothing
3- If the signal is applied to the input of a non-inverting amplifier through the resistance of 100-kilo ohm, the value of feedback resistance is 10-kilo ohm, and the gain of the amplifier is equal to:
a) 11
b) 1.1
c) 10
d) 0.11
4- When an operational amplifier (Op-amp) is used to compare two voltages V1 and V2, its output is:
a) V1-V2
b) V2-V1
c) [V1-V2]
d) None of these
5- Davison and Germer's experiment proves:
a) Wave nature of electron
b) Particle nature of electron
c) Both
d) None
6- According to Heisenberg's uncertainty principle, for any given particle it is not possible to accurately measure:
a) Both position and momentum
b) Its Momentum
c) Its position
d) Its velocity
7- When the light has precisely the same energy as the work function of a metal surface then:
a) No photoelectrons are produced
b) No photo-electric effect is observed
c) No photo-electric current is produced
d) All of these
8- The process of generating three-dimensional images of objects by using a laser beam is called: (UHS 2014)
a) Photography
b) 3-D cinema
c) Holography
d) Tomography
9- One method of creating an inverted population is known as ________ and consists of illuminating the laser material with light: (UHS 2015)
a) Optical pumping
b) Excitation
c) Bremsstrahlung
d) Holography
10- In population inversion (ruby laser) atoms can reside in the excited state for: (UHS 2015)
a) 10^-11
b) 10^-8
c) 10^-3
d) 10^+3
11- The hardest photon coming out from a Coolidge tube belongs to: ( MDCAT 2017 )
a) Characteristic x-rays
b) Continuous x-rays
c) Both "A" & "B"
d) None of these
12- When X-rays are produced by fast-moving electrons striking a heavy metal, the x-ray spectrum contains: (ECAT 2019)
a) Discrete Lines
b) Both Discrete Lines and Continuous spectrum
c) Continuous spectrum
d) Only two Discrete lines
13- Sodium-24 is used for: (UHS 2016)
a) Sterilization
b) Study of circulation of blood
c) Thyroid cancer
d) Skin cancer
14- What is the absorbed dose D of a sample of 2 kg which is given an amount of 100 J of radioactive energy? (UHS 2014)
a) 200 Gy
b) 102 Gy
c) 50 Gy
d) 98 Gy
15- Cobalt-60 is used in medicine and is an intense source of: (UHS 2015)
a) Neutrons
b) alpha-particles
c) Beta-particles
d) Gamma-rays
16- Sodium 24-has a half-life of 15 hours and it is used in medicine estimates: (UHS 2015)
a) Kidney Function
b) Plasma blood volume
c) Iron in plasma
d) Thyroid function
17- What is the name of the energy which is released when an atom is formed from its constituent particles? (UHS 2018)
a) Atomic Energy
b) Radioactive Energy
c) Nuclear Energy
d) Binding Energy
18- Calculate the half-life of bismuth-214 which has a decay constant of 4.3 x10^3 1/s: (UHS 2018)
a) 2.9 x 10^-3 s
b) 1.6 x 10^-4 s
c) 3.9 x 10^-3 s
d) 2.9 × 10^³ s
19- The half-life of radium is about 1600 years. If 100 g radium exists now, 25 g will remain un-decayed after: (UHS 2017)
a) 4800 years
b) 3200 years
c) 2400 years
d) 6400 years
20- When an electron of an atom in its excited state returns to its ground state, the following type of radiations are emitted: (ECAT 2019)
a) Alpha and gamma
b) Beta and gamma
c) Gamma
d) Alpha, beta, and gamma
21- In nuclear reactions, it is possible to: (ECAT 2019)
a) Transform an element into another
b) Produce neutron
c) Produce energy
d) All of the above
