As physics p1 MCQS YEARLY ONLY.

[Hadi Murtaza]

I showed all steps ._.
C is inelastic coz it is moving in one direction, and D is inelastic coz its stick
._. So for inelastic either speed is in same dirctn or it is stick and hence C and D are inelastic
Now say :/

Now say wat ?

 

[Thought blocker]

Now say wat ?

How m I wrong ._. I mean I showed all steps, I didn't skipped a single step ._.

 

[Hadi Murtaza]

How m I wrong ._. I mean I showed all steps, I didn't skipped a single step ._.

Yah but u showed now, b4 u didnt

 

[Thought blocker]

Yah but u showed now, b4 u didnt

Coz I showed the steps in 1st post of that doubt, so I just showed that C and D is inelastic lol..

 

[Hadi Murtaza]

Coz I showed the steps in 1st post of that doubt, so I just showed that C and D is inelastic lol..

kay

 

[Thought blocker]

kay

I AM CORRECT
BUZZZZZZZZZZZZZZZZZ

 

[dumb human]

November 2007

1-C
Use base units and equate both sides.

2-A
Learn the approximations.

3-B
Resultant force is always is opposite direction of its two components in the triangle of forces.

4-D
Precision is the closeness of measured values.
Accuracy is the closeness of measured values to actual value.

5-C
P = fv
f = ma and v = s/t

P = add up all the % uncertainties.
%P = 0.1 + 1 + 1.5 + .5
= 3.1 %

6-A
Due to zero error, the initial value of angle of deflection will be greater than zero at zero current.

7-A
Basic concept that g gravity is the acceleration of free fall.

8-D
The gradient of velocity-time graph is acceleration.


9-B

Area of distance above x axis - area of distance below x axis.
(0.5 * 3 * 30) - (.5 * 2 * 20)
= 25 m

10-D

Driving force - frictional force = ma
12- Fre = 0.6(4)
12- 0.6(4) = Fre
9.6 N = Fre

11- B
View attachment 12245

12-A
Since the parachutist is falling, height is decreasing over time.
Gradient of distance-time graph is speed.

13-C
Use head to tail method.

14-D
At midpoint, d = 0.8/2 = 0.4m
Moment = F*d
12 = F * 0.4
30 N = F

15-B
Initial K.E. - Final K.E.
(0.5* 1000 *25^2) - (0.5 * 1000 * 5^2)
300 000 J
300 kJ

16 - C
At max d, K.E. = minimum and elastic potential energy = maximum.

17-C
Density = mass/volume
Hence higher density means a higher mass, hence more no. of atoms.
So MpNp > MqNq

18-A
Height at surface =?
Pressure = density * g* h
100 000= 1030 * 9.81 * h
9.896 m = h1

Height at 450 kPa =?
450 000 = 1030 * 9.81 * h
44.535 = h2

Therefore height below surface = 44.535 - 9.896
=34.639 ~ 34.6m

19-B
Basic definition.

20- A
Strain energy = 1/2 * F * extension
= 0.5 * 25 * (0.4 - 0.2)
= 2.5 J

21- B
View attachment 12247

22- B
Learn the wavelengths.

23- B
Max speed = 2pii *a *f
f = ?
s = f* lamda
8 = f (50)
0.16 Hz = f

Max speed = 2pii * 2 * 0.16
=2 m/s
Max K.E. = .5 m* v^2 = 0.5 * 2 * 10^-3 * 2^2
= 4 mJ

24-D
x = lamda * D/ a

Hence increasing the lamda, increases x, that is the fringe separation.

25-B

d sin theta = n* lamda
At n = 3, theta = 45 degrees
d sin45 = 3*lamdaa
0.7 d = 3 lamda

and max angle = 90 , so n =?
d sin90 = n*lamdaa
d = n* lamda

Using the ratio method:
If 0.7d = 3 lamda
1 d =?
cross multiply and you get n as 4.25 hence rounding it off to 4th order.

26- C
Since electric field direction is from higher p.d./charge to lower p.d./charge the electron will be attracted towards the more positively charged plate (or direction) hence to the left.

27-D
Direction of electric field is away from positive charge.

28-B
E = V*Q
E/Q = V

29-D

P = V^2/R
P = 12^2/Rx and P = 6^2/Ry
Rx = 144/P and Ry = 36/P

Rx/Ry = 144/P divided by 36/P
Rx/Ry = 144/36 = 4

30-D

V = IR
6 = I (10 +10)
0.3 A = I

Q = It
0.3 * 60 = 18 C

31-A

View attachment 12248

32-A

Basic concept of L.D.R.; when light intensity increases, resistance decreases hence voltage decreases too.

33-D
V in = R1/T.R. * V out
4.8 = 10/25 * V out
4.8* 25/10 = V out
12 = V out

34-D
Using the ratio method:
If 1.1 V - 0.7 m
? - 0.9 m
x = 0.9* 1.1/ .7
x = 1.4 V

35-A
The readings won't change because the set up is the same.

36- C
Charge is same since proton no. is same, but mass differs since no. of neutrons differs.

37- C
Basic concept.

38-C
The alpha scattering experiment proves the small size of a gold nucleus.

39-B
In a beta emission, the nucleon no. remains same but the proton no. increases by 1
For 2 beta emissions, proton no will increase by 2 hence 40 +2 = 42

40-A
Momentum = mv, greater m = greater momentum.
hence the particle with the greatest mass from all the choices is A, an alpha particle.

but in the Mark Scheme....7) is C :/

 

[Thought blocker]

but in the Mark Scheme....7) is C :/

Good Morning Ma'am....
Here it is very simple... :¬ (Use the formula of weight to prove g = W / m)
Weight (W) = mass (m) times (*) acceleration of free fall (g)
So now g = W/ m that is g is the ratio weight / mass.
Hence answer is C

 

[forever_chocoholic]

but in the Mark Scheme....7) is C :/

yup answer is C not A

 

[Thought blocker]

yup answer is C not A

So I explained na.......
W = mg so g = W / m

 

[forever_chocoholic]

I showed all steps ._.
C is inelastic coz it is moving in one direction, and D is inelastic coz its stick
._. So for inelastic either speed is in same dirctn or it is stick and hence C and D are inelastic
Now say :/

inelastic is only when the objects stick together after collision...
u cant say its inelastic just because they move out in the same direction after collision.. are u sure?

 

[Thought blocker]

inelastic is only when the objects stick together after collision...
u cant say its inelastic just because they move out in the same direction after collision.. are u sure?

Yes I am sure.... I gave that link watch that video if you doubt me...

 

[forever_chocoholic]

Yes I am sure.... I gave that link watch that video if you doubt me...

achaw link do

 

[Thought blocker]

no they said in the questiontself that g= acceleration due to free fall


achaw link do

han so W = mg na ?

 

[Thought blocker]

Youtube ki hain

 

[forever_chocoholic]

han so W = mg na ?

galti se likha tha
link do

 

[Thought blocker]

galti se likha tha
link do

Shamajh to agaya na

 

[Thought blocker]

Classical Mechanics : CLICK HERE watch after 11:21 minute

 

[forever_chocoholic]

Shamajh to agaya na

haan

 

[Thought blocker]

haan

got the answer ?