Two identical balls collide head-on elastically. If ball A has velocity u and ball B has velocity -u before collision, after collision:
Aball A has velocity -u and ball B has velocity u
Bboth balls come to rest
Cball A has velocity u and ball B has velocity -u
Dboth balls move with velocity zero
EAPCETPhysics
The escape velocity from the surface of the Earth is v_e. If the Earth suddenly shrinks to 1/nth of its present radius without any change in mass, the new escape velocity will be:
Av_e
Bv_e * sqrt(n)
Cn * v_e
Dv_e / sqrt(n)
BITSATPhysics
The beat frequency produced by two waves of frequencies 250 Hz and 254 Hz is:
A504 Hz
B4 Hz
C1 Hz
D252 Hz
JEE MainPhysics
In a circuit, a 12 V battery is connected in series with a 4 Ω resistor and a 2 Ω resistor. The potential difference across the 4 Ω resistor is:
A4 V
B6 V
C8 V
D10 V
NEETPhysics
A sound source emits waves of frequency 500 Hz and moves toward a stationary observer at 30 m/s. The apparent frequency heard by the observer is: (speed of sound = 330 m/s)
A550 Hz
B500 Hz
C455 Hz
D600 Hz
BITSATPhysics
The moment of inertia of a uniform rod of mass M and length L about an axis perpendicular to the rod and passing through its center is:
AML²/3
BML²/6
CML²/12
DML²/2
GATEPhysics
The uncertainty principle between position and momentum was first derived by:
AHeisenberg
BSchrödinger
CBorn
DDirac
NEETPhysics
Light of wavelength 600 nm is incident on a metal surface. The work function of the metal is 2.0 eV. The maximum kinetic energy of the emitted photoelectrons is: (h = 6.626 × 10⁻³⁴ J s, c = 3 × 10⁸ m/s)
A0.07 eV
B2.07 eV
C1.07 eV
D0.50 eV
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