Mdcat-past-papers - UHS Quiz

321. Work done due to centripetal force for circular motion will be:

Maximum
Reduced
Half
Zero

322. A fighter plane is moving in a vertical circle of radius r. Its minimum velocity at the highest point of circle will be:

√3gr
√2gr
√gr
√gr/2

323. The circular line has fix distance from -----?

Any point
A point on a circle
A fix point
Point from outside

324. If a particle is moving on uniform circular motion, then:

V and a are anti-parallel
V and a are parallel
V and a are perpendicular
Zero acceleration

325. A particle of mass 'm' is moving on a circular path of radius 'r' with velocity 'v', then centripetal force acting on it is F. If the velocity of particle increases by 2 times and radius of circular path increases by 4 times then new centripetal force F' will be:

F' = 2F
F' = 1⁄2 F
F' = 4F
F' = F

326. A roller coaster is moving with 30ms⁻¹ on a circular track of radius 30m. The net mass of coaster + passengers is 'm' the centripetal force acting on it is:

900m
30m
450m
30m

327. In a simple harmonic motion with a radius 'x' the velocity of the particle at any point is :

V = ω√x₀²−x²
v₀ = √k/m√x²−x²
v = x₀√1−x²/x₀²
v₀ = ω√x²−x²

328. Mathematical formula of maximum velocity (v₀) for a body executing SHM is :

v₀ = ωx₀
v₀ = √k/m√x₀²−x²
v₀ = √1−x²/x₀²
v₀ = ω√x₀²−x²

329. A body performing SHM with displacement x = x₀ sin(ωt + ϕ). At t = 0, x = x₀. Then what is the phase angle ϕ?

π
π/4
π/2
−π

330. A long spring, when stretched by a distance x, has potential energy V. On increasing the stretching to nx, the potential energy becomes:

nV
V/n
n²V
V/n²

331. When will the oscillations stop in the absence of resistive forces?

Never
After 10 minutes
In 10 minutes
Immediately

332. If the length of the second pendulum becomes four times, then its time period will become:

4 times
Half
2 times
One fourth

333. Period of mass-spring system if mass/spring constant = 1/4?

π
1/π
2π
1/2 π

334. A SHM oscillator has period 10 s. Acceleration equation is:

a = −2x
a = −(2π/10)²x
a = −(20π)x
a = −(2π)²x

335. Reducing mass M to 1/4th will change frequency to:

One fourth
Double
Quadruple
Half

336. A source of sound waves emits frequency "f". If "v" is speed of sound waves, then what will be the wavelength of the waves?

v/f
vf
v = U/f
(v − U₀)f

337. A shock wave is produced due to an earthquake which makes the buildings move in the direction of the shock wave. Which progressive wave would this be?

Longitudinal wave
Transverse wave
Material wave
Particle wave

338. The mechanical waves are not generated by:

Electric and magnetic fields
Coil of springs
Ropes
Water

339. The shortest distance between any two points in phase on a wave is called:

Displacement
Amplitude
Wavelength
Frequency

340. Which of the following increases by increasing amplitude?

Wavelength
Frequency
Zero
Loudness