531. Doppler’s effect is the principle understanding?
A) Measuring blood flow speeds
(B) Magnetic imaging
(C) CT scans
(D) None of the above
532. Colour of light emitted by an LED depends on?
(A) Its reverse bias
(B) Its forward bias
(C) Amount of forward current
D) Type of semiconductor material used
533. Rate of change of linear momentum p is equal to the?
(A) Acceleration
(B) Impulse
C) Force
(D) Velocity
534. Four resistances R1 = 20Ω, R2 = 50Ω, and R3 = 1Ω are connected in parallel. The equivalent resistance is R:
(A) R > 1Ω
(B) R > 3Ω
C) R < 1Ω
(D) R < 4Ω
535. The magnitude of the force of gravity between two identical objects is given by F0. If the mass of each object is doubled and the distance between them is doubled. Then the new force of gravity between the objects will be?
(A) F0/16
B) F0
(C) 2F0
(D) 4F0
536. The force of gravity above the earth’s surface is proportional to, and inside the earth, it is proportional to?
(A) 1/r, r
(B) 1/r, r²
C) 1/r², r
(D) 1/r², r²
537. A monkey sits on an elevator’s spring scale pan. The reading of the spring scale is at its highest point when:
A. Elevator is stationary
B. Elevator cable breaks and it falls freely towards earth
C. Elevator accelerates downwards
D. Elevator accelerates upward
538. A lift is climbing with speed increase equivalent to 1/5 of that because of gravity. The evident load of a 60 kg man remaining in the lift is:
A. 60 KG WT
B. 72 KG WT
C. 48 KG WT
D. Zero
539. The body’s mass at rest, as determined by physical balance in a lift, is m. If the lift is moving upward at an acceleration of a, its mass will be determined as follows:
A. M(1-a/g)
B. M(1+a/g)
C. M
D. Zero
540. A person is facing the engine while seated in a moving train. When he tosses a coin, it disappears behind him. The train can be characterized as:
A. Moving forward and gaining speed
B. Moving forward and losing speed
C. Moving forward with uniform speed
D. Moving backward with uniform speed
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