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Quiz 224
Mdcat-past-papers Quiz
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4461. After 3 half-lives, the remaining fraction of a radioactive sample is:
1/2
1/4
1/8
1/16
4462. If the horizontal range of a projectile becomes half of its maximum possible horizontal range, the probable angle of projection is:
15°
30°
45°
60°
4463. In an ideal transformer, if the primary voltage is doubled and the turns ratio remains the same, what happens to the secondary current?
Doubles
Naives
Remains the same
Becomes four times
4464. An angular displacement of 90° is equal to:
One-fourth revolution
One- third revolution
One half revolution
One complete revolution
4465. The time in which half of the given number of radioactive nuclei decay is known as :
1/2 life of radioactive element.
2/3 life of radioactive element.
1/4 life of radioactive element.
2/5 life of radioactive element.
4466. Earth receives large amount of energy directly from:
Wind
Water
Sun
Moon
4467. A phase difference of 90° is equal to:
n radians
n / 2 radians
2n radians
n / 4 radians
4468. The reciprocal of the resistivity of a material is called its:
impedance
conductivity
admittance
reactance
4469. The Balmer series of hydrogen spectrum appears in :
Infrared region
Ultraviolet region
X-ray region
Visible region
4470. A ball is thrown into the air with certain velocity v making an angle θ with horizontal. If air resistance is neglected, then at maximum height its velocity is:
Equal to initial velocity
Half of initial velocity
Equal to zero
Minimum but not zero
4471. A canon is placed on a smooth surface. When it fires a shell, the canon moves backward, this recoil occurs due to:
Law of conservation of energy
Backward thrust of the gases
Newton's third law of motion
Newton's first law of motion
4472. If the surface charge density of an infinite sheet increases by 25%, the electric field intensity:
Increases by 25%
Increases by 50%
Decreases by 25%
Remains the same
4473. An incompressible fluid flows through a pipe that becomes narrower in one section. The fluid speed increases in that region to maintain:
Constant pressure
constant energy
constant mass flow rate
constant volume
4474. In a pipe of varying cross-section as fluid enters the narrower region, it exhibits:
high velocity, high pressure
high velocity, low pressure
low velocity, high pressure
low velocity, low pressure
4475. The curved shape of an airplane wing causes air to move faster over the top surface. This leads to:
greater pressure on the top
lower pressure on the top
equal pressure on both sides
zero pressure above the wing
4476. The protons in the nucleus of an atom DO NOT exit due to :
Electromagnetic force
Gravitational Force
Weak Nuclear Force
Strong Nuclear Force
4477. Mechanical waves cannot travel through outer space because they:
have low speed in vacuum
disperse in space due to long wavelength
lose frequency in the absence of air
lose transmission without interacting particles
4478. Terminal voltage of a cell equals its EMF only when :
No current flows
Current is maximum
Internal resistance is infinite
Load resistance is zero
4479. A loop moves toward a stationary magnetic line induced current will:
enhance the motion
try to stop the approach
become zero
become alternating
4480. The energy of a Simple Harmonic oscillation depends upon the :
frequency
time period
wavelength
amplitude
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