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Home » Medical Papers » UHS MDCAT » Aptitude Test - 16
1.Half-life of a radioactive element is:
A. Inversely proportional to square of decay constant
B. Directly proportional to square of decay constant
C. Directly proportional to decay constant
D. Inversely proportional to square of decay constant
2.The transformation of a neutron into proton in the nucleus gives rise to emission of:
A. Beta particles
B. Alpha particles
C. Gamma particles
D. Beta particles
3.The ratio of the rate of decay of a parent atom to the number of radioactive nuclei present at that time is equal to:
A. Half-life of radioactive element
B. Mean life
C. Decay constant of radioactive element
D. Half-life of radioactive element
4.Which one of the following particle is emitted as a result of nuclear reaction?
A. Beta
B. Alpha
C. Gamma rays
D. Beta
5.When a lift is accelerated upward, the apparent weight of an object in it will be
A. Equal to its real weigh
B. Less than its real weight
C. Zero
D. Equal to its real weigh
6.Which of following is used to estimate the circulation of blood in a patient?
A. Carbon-14
B. Carbon-12
C. Phosphorus-32
D. Carbon-14
7.For the radiotherapy of a patient, it is required to double the absorbed dose in gray. What step must be taken?
A. Energy must be quadrated
B. Energy must be halved
C. Energy must be raised four times
D. Energy must be quadrated
8.The moment of inertial of a thin rod is
A. 1 /2 mL2
B. 1 /4 m3L
C. 1/12 mL
D. 1 /2 mL2
9.In mass spectrometer, detector or collector measures the:
A. Masses of isotopes
B. Percentages of isotopes
C. Relative abundances of isotopes
D. Masses of isotopes
10.A wheel of radius 1 m covers an angular displacement of 180. Its linear displacement is
A. 3.14 m
B. π rad
C. 6.28 m
D. 3.14 m
11.Melting point of water is higher than petrol, because intermolecular forces in water are:
A. Weaker than petrol
B. Stronger than petrol
C. Same as in petrol
D. Weaker than petrol
12.Conservation of mass of fluid flow leads to
A. Bernoulli’s equation
B. Venturi meter
C. Equation of motion
D. Bernoulli’s equation
13.DNA molecule is double stranded, in which two chains of DNA are twisted around each other by:
A. Hydrogen bonds
B. Vander Waal's force
C. Covalent bonds
D. Hydrogen bonds
14.The elements for which the value of ionization energy is low, can:
A. Gain electrons readily
B. Gains electron with difficulty
C. Loss electrons less readily
D. Gain electrons readily
15.The blood vessels collapse when
A. External pressure applied becomes greater than the systolic pressure
B. External pressure applied is equal to systolic pressure
C. External pressure applied is less than the systolic pressure
D. External pressure applied becomes greater than the systolic pressure
16.An oscillating body is at mean position at t = 0. At t = T/4 it will be at
A. Extreme position
B. Mean position
C. Between extreme and mean position
D. Extreme position
17.The nature of cathode rays in discharge tube:
A. Depends on the nature of gas taken in the discharge tube
B. Depends upon the nature of cathode in discharge tube
C. Is independent of the nature pf the gas in discharge tube
D. Depends on the nature of gas taken in the discharge tube
18.In a simple pendulum, the tension of the string is
A. g cos θ
B. mg sin θ
C. mg cos θ
D. g cos θ
19.The ability of an atom in a covalent bond to attract the bonding electrons is called:
A. Ionization energy
B. Ionic bond energy
C. Electronegativity
D. Ionization energy
20.Two sound waves having the same amplitudes are moving in the same direction are out of phase. The amplitude of the resultant wave is
A. Zero amplitude
B. The sum of amplitude of the two waves
C. Difference of the amplitudes of the two waves
D. Zero amplitude
21.The paramagnetic character of a substance is due to:
A. Bond pairs of electrons
B. Lone pairs of electrons
C. Unpaired electrons in atom or molecule
D. Bond pairs of electrons
22.A source ‘Y’ of unknown frequency produces 4 beats with a source of 240 Hz and 8 beats with a sound of 252 Hz. Frequency of the source ‘Y’ is
A. 244 Hz
B. 236 Hz
C. 248 Hz
D. 244 Hz
23.An organ pipe closed at one end has a length of 25 cm. Wavelength of the fundamental note is
A. 25 cm
B. 50 cm
C. 100 cm
D. 25 cm
24.Lattice energy of an ionic crystal is the enthalpy of:
A. Combustion
B. Dissociation
C. Dissolution
D. Combustion
25.In Newton ring apparatus, at the point of contact of the lens and glass plate, the additional path difference introduced is
A. λ/4
B. λ/2
C. λ
D. λ/4
26.In standard enthalpy of atomization, heat of the surrounding:
A. Remains unchanged
B. Increases
C. Increases than decreases
D. Remains unchanged
27.Mole fraction of any compound us the ratio of moles of all components in a:
A. Compound
B. Solution
C. Molecule
D. Compound
28.The path difference ‘BD’ for destructive interference is
A. (m + ½) λ
B. mλ
C. d sin θ
D. (m + ½) λ
29.In the case of a grafting spectrometer, the resolving power ‘R’ of the grating is defined as
A. λ / Δλ
B. λ / D
C. λ / λ1
D. λ / Δλ
30.Which one of the following lights travels fastest in optical fibers?
A. Visible light
B. Ultraviolet light
C. Ordinary light
D. Visible light
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