371. A bullet of mass 100 g leaves the gun of mass 10 kg, with a muzzle speed of 100 m/s. The speed of recoil of the gun is:
A. 10 m/s
B. 100 m/s
C. 100 cm/s
D. 1 m/s
372. A 30 g carom striker moving with a velocity of 10 cm/s strikes a 5 g stationary carom disc head-on elastically. The striker acquires a velocity of 6 cm/s. The disc gained the following momentum:
A. 30 g·cm/s
B. 120 g·cm/s
C. 50 g·cm/s
D. 150 g·cm/s
373. The acceleration of the body as it rolls down an inclined plane with a 30-degree angle to the horizontal:
A. 9.8 m/s²
B. 4.9 m/s²
C. 2.8 m/s²
D. None
374. When two bodies collide elastically, they interchange their velocities when their:
A. Masses are equal
B. Velocities are equal
C. Accelerations are equal
D. None
375. When a force of 4 N acts on a body of mass 2 kg for 2 seconds, the rate of change of momentum is S1 units:
A. 1
B. 2
C. 3
D. 4
376. All of the ions that pass through crossed electric and magnetic fields without deflection have?
A. Speed
(B) Energy
(C) Momentum
(D) Mass
377. Water is an excellent solvent because its molecules are?
(A) Neutral
B) Polar
(C) Covalent
(D) Non-Polar
378. A molecule whose charge distribution is not perfectly symmetrical is called?
(A) An electrolyte
B) A polar molecule
(C) A non-polar molecule
(D) An organic molecule
379. There are no expected lines absent from the spectra of?
(A) The halogens
(B) The alkali metals
C) Hydrogen
(D) The inert gas
380. Two electrons in a helium atom?
A) Occupy different subshells
(B) Have parallel spin
(C) Occupy different shells
(D) Have opposite spin
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