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As physics p1 MCQS YEARLY ONLY.

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in q2 why is the answer C and not D??
in Q31 why is the ans D and not C?
IN q38 how do we know whether the speed of the electron will increase or decrease?
When u have 2 vectors, look at their ' x ' n ' y ' directions. If both point in 1 direction, then da resultant will also point in dat direction. If dey point in opposite directions, den da vector whose component is bigger will give da resultant direction.
So here both X n Y r pointing towards da right of P, so da resultant will also point towards da right of P
 
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When u have 2 vectors, look at their ' x ' n ' y ' directions. If both point in 1 direction, then da resultant will also point in dat direction. If dey point in opposite directions, den da vector whose component is bigger will give da resultant direction.
So here both X n Y r pointing towards da right of P, so da resultant will also point towards da right of P
LOL I know that, but 31 and 38 ._. ?
 
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Q15 AND Q29 plzzzzzzzzz?
15)
since torque is equal to force*distance,
the distance moved by the spindle will be the torque,
i.e L/4 means, WL/4 and will always be clockwise in this condition
P.S. this was a stupid question just remember the fact that the distance moved by
the spindle will be multiplied by the weight of the cube W. (y)

29)
c = fλ
f = 1 / t
c = λ / t
t = λ / c
here we can see from the diagram that there are total of 3 wavefronts from XY to P
so, t = 3λ / c
 
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the force required to make the cube topple is in clockwise direction so shouldnt the force required to stop the cube from toppling be in anticlockwise direction???
 
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Q1: A micrometer screw gauge is used to measure the diameter of a small uniform steel sphere. The micrometer reading is 5.00 mm ± 0.01 mm.
What will be the percentage uncertainty in a calculation of the volume of the sphere, using these values?

A 0.2% B 0.4% C 0.6% D 1.2%

Ans: C

Q2: An aeroplane travels at an average speed of 600 km h–1 on an outward flight and at 400 km h–1 on the return flight over the same distance. What is the average speed of the whole flight?

A 111 m s–1 B 167 m s–1 C 480 km h–1 D 500 km h–1

Ans: C
 
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A beam of α-particles collides with a lead sheet. Each α-particle in the beam has a mass of
6.6 × 10–27 kg and a speed of 1.5 × 107
m s–1.

5.0 × 104
α-particles per second collide with an area of 1.0 cm2
of lead. Almost all of the
α-particles are absorbed by the lead so that they have zero speed after collision.

What is an estimate of the average pressure exerted on the lead by the α-particles?
A 5.0 × 10–15 Pa
B 5.0 × 10–13 Pa
C 5.0 × 10–11 Pa
D 5.0 × 10–9 Pa

ANS: C
 
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