# Solved Past Papers MCQs of MDCAT 3

## Solved Past Papers MCQs of MDCAT 3

Solved Past Papers MCQs of MDCAT for the preparation of Medical and Dental College Admission Test and other medical tests.

PHYSICS

Q.1 Which one is the highest power multiple?

A) Giga C) Mega

B) Tera D) Deca

Q.2 SI unit of charge is _______.

A) Ampere C) Coulomb

B) Volt D) Calorie

Q.3 The electrical analog of mass is electricity is _________.

A) Capacitance C) Charge

B) Inductance D) Resistance

Q.4 Which one of the following relations is correct?

A) 1 wb m-2 = N m-1 A-1 C) 1 wb m-2 = 1 Tesla

B) 1 Tesla = 104 Gausses D) All of these

Q.5 Life time of electron in metastable state is about _________.

A) 10-5 sec C) 10-8 sec

B) 10-3 sec D) 10-2 sec

Q.6 The torque acting on a current carrying coil is given by _____________.

A) τ = NIAB cos α C) τ = NIAB sin α

B) τ = BIL sin α D) τ = BIL cos α

Q.7 The grid in the cathode ray oscilloscope _____________.

A) Controls number of waves C) Accelerates electrons

B) Controls the brightness of spot formed D) Has positive potential with respect to cathode

Q.8 The horizontal range of a projectile, at a certain place, is completely determined by

A) The angle of projection C) The mass of the projectile

B) The initial velocity of projection D) Speed and mass of the projectile

Q.9 If velocity is double, then.

A) Momentum increase 4 times and K.E increases 2 times

B) Momentum and K.E remain same

C) Momentum increases 2 times and K.E increase constant

D) Momentum increases 2 times and K.E increases 4 times

Q.10 The consumption of energy by 60-watt bulb in 2 seconds is:

A) 20 J C) 30 J

B) 120 J D) 0.02 J

Q.11 In transistors, the base region is very thin, of the order of

A) 10-5 cm C) 10-6 mm

B) 10-6 m D) 10-6 μm

Q.12 The closed loop gain of OP-AMP depends on

A) Internal structure of OP-AMP C) Voltage of power supplies

B) Externally connected resistances D) Input resistance

Q.13 The net charge on an N-type substance is

A) 0.7 volts C) 0.25 volts

B) 0.3 volts D) 0.07 volts

Q.14 The value of Wien’s constant is

A) 2.90 x 10-3 mK C) 4.22 x 10-7 mK

B) 3.34 x 10-4 mK D) 3.42 x 10-8 mK

Q.15 The minimum frequency below which no electron is emitted from the metal surface is called

A) High frequency C) Threshold frequency

B) Low frequency D) Resonance frequency

Q.16 In pair production, the type of photon used

A) α-particle C) X-rays

Q.17 The life time of an electron in an excited state is about 10-8 s. What is its uncertainty in energy during this time?

A) 1.05 x 10-41 J C) 1.15 x 1010 J

B) 1.05 x 10-26 J D) 2.19 x 10-40 J

Q.18 Velocity of electron moving in first orbit of hydrogen is

A) 2.19 x 107 m/sec C) 2.2 x 108 m/sec

B) 2.18 x 107 m/sec D) 2.19 x 106 m/sec

Q.19 LASER is a potential energy source for inducing which type of reaction?

B) Fission D) Fusion

Q.20 In the half-life of an element, the equation for the number of decaying atoms is given by

A) ΔN ∝ -NΔt C) ΔN ∝ -nΔt

B) ΔN = KNΔt D) ΔN = -ΔNΔt

Q.21 Decay constant ‘λ’ is given as

A) – ΔN/N/Δt    C) – N/Δt

B) – ΔN/Δt         D) ΔN/N/Δt

Q.22 The SI unit of absorbed dose ‘D’ i.e. radiation effect is Gray and one Gray is equal to

A) kJ / mol C) kg / J

B) J / mol D) J / kg

Q.23 The principle of homogeneity of dimensions determines

A) Only variable in the equation C) Correctness of an equation

B) Only constant in the equation D) Constant and variable in the equation

Q.24 For a body to be in complete equilibrium

A) Linear acceleration is zero

B) Angular acceleration is zero

C) Linear acceleration is zero but angular acceleration is not zero

D) Linear acceleration and angular acceleration both should be zero

Q.25 If length of a spanner is ‘I’ and a force ‘F’ is applied on it to tighten a nut such that it passes through the pivot point, then torque is

A) Zero C) Fl sin θ

B) Ff D) Fl sin θλ 