As physics p1 MCQS YEARLY ONLY.

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June 2007

1: C...basic stuff
2: D..also basic stuff
3: im to0 sry i couldnt do this one and i would appreciate if some 1 can help me with it
4: C...one wavelength is 4 squares..so 4 x 2.5 = 10...amplitude is about 3.5 so 3.5 x 5= about 17
5: A...V=IR...1.2V / 0.48A= 2.5
6: D...again basic stuff
7: C...v is the vector sum of u and x and v=u +at so X is at so C
8: A...s= ut + 0.5at^2...get the time when the distance is 40m ..then when the distance is 30 m...then T1 - T2 = 0.38s
9: B..basic stuff
10: D...F=( mv - mu)/t ...so substituting into the equation it is ( p1 - p2)/ ( t2 - t1)
11: B... (20000 x 20) - (900 x 30) = 373000Ns
12: B...1st get the final V by: m1u1 + m2u2 =(m1 + m2)v so (2 x 4) + (4 x 1)= 6V..V = 2 then he said it stuck together so 0.5 x m x v^2 so 0.5 x 6 x 2^2= 12J
13: B...torque of a couple is defined as the 1 force x perpendicular distance between the 2 forces..so geth the perpendicular force by drawing a straight line perpendicular to the force..then use adj/hyp = cos( theta) so adj= 0.6 sin (30) so 0.52...0.52 x 8 = 4.2
14: C...basic stuff
15: A...P=pgh...so 100000/ (13.6 x 10^3) x 9.81 = h... so h = 0.75m
16: C... A is wrong because liquids doesnt have a very big seperation..B is wrong because it describes a gas..D is wrong because liquid atoms are not in fixed positions
17: C...copper is not brittle..and when drawn to a wire it will not return to its original shape again so plastic only
18: B... the whole area under the graph is the strain energy...and the unhighlited part which is between the 2 drawn lines is the heat enerfy..so the shaded are is B
19: A...1/2 F X so 0.5 x 2 x (0.90 - 0.50)= 0.40J
20: B...X is in tension as it is opposing the weight of the horizontal bar and the foce W...Y is aso in tension as it is opposing W..Z is in compression as it is between a force from X and a force of Y and W
21: C...A & B are wrong because no longitudnal waves are polarises..D is wrong because sound is longitudnal not transverse so C
22: A...I is proportional to a^2..try ti solve tis example by giving the intensity I of y a magnitude of 3600 and the intensity of X a magnitude greater than y by 10^12 then find the amplitude for both..it will be A the answer
23: D...im weak inthis kind of a question but i know that at Q it is not always zero at and R it is not entirley kinetic and at p the speed is not at maximum..so D
24: D..you must memorize this
25: C...basic stuff
26: D...A is wrong because decreasing the distance between the slits and the screen will decrease the fring seperation, B is wrong because this will also decrease the seperation..C is wrong because this will affect the intensity not the seperation..so increasing the frequency decreases the wavelength so seperation increase so D
27: A..stationary wave is when 2 owaves travelling opposite to each other ( so B and C is wrong) then he said 2 nodes and antinodes so a have 2 points shown so 2 nodes and anti nodes
28: D..basic stuff
29: A...again basic stuff to ne known..electron is attracted to +ve plate
30: B...E= v/d...so 4v / 2d so 2E
31: D..just memorize ohm's law..and becareful it is not A because he said they are equal not proportional
32: A...Q=It...(8 x 10^-3) x 0.020 = 0.16 mC
33: C....V1= 5000/ (5000+5000) x 2 = 1V then V2= 3000/ (3000 + 2000) x 2 = 1.2 so V1 - V2 = -0.2 so C
34: A...V was 4...then light increases so R decreases so V decreases and the only number less than 4 in the answers is 3V so A
35: C...W= QV so V = W/Q and I = Q/t
36: C... V= IR, i= v / r...3/ 2 + 4= 0.5..then pd= 0.5 x 4=2 then I= E/ (R+r) sp P = RI^2 so P= (E/R+r)^2 x R so (3/ ( 4+ 2)^2 x 4 = 1 so C
37: C...R = pl/A he siad they have same length..and they are of the same material so same resistivity..then he said of same volume and volume = A x h so same area so same Resistance so C
38: A...basic stuff
39: D..again B particle is 0 nucleon number and -1 is the proton number so D
40: C .... divide the proton number by the nucleon numbre for each element lithium will give the smaleest number so c
 
Messages
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Points
173
June 2003

1-B
because mass has magnitude only.

2-B
Work done = Force*distance
kgms^-2 *m = kgm^2 s^-2

3-B
Using cosine rule: c^2 = a^2 + b^2 +2abcosC
c^2 = 10^2 + 10^2 +2(100)cos 120
C = 10 N

4-A
Basic concept that a systematic error can be reduced by checking for zero error.

5-C
because 3% of 330 = 10 m/s
and speed of sound = 330 m/s

6-B
Accuracy: closeness of the measured values to the true value
Precision: closeness of measured values.

7-C

For vertical component: v = u +at
v = usina - gt
and in horizontal component v = u cos a

8-C
In the first 1/3 of the graph, velocity is increasing hence the gradient should be increasing steeply.
In the second 1/3 of the graph, velocity is constant so gradient should be constant, hence a straight line.
In the last 1/3rd of the graph, gradient is decreasing hence line should be least steep.

9-D
because the distance in X is the distance from the ground to the max height after first impact and distance Y is the distance from the max height back to the ground.

10-D

F= ma
Total mass = 4m
hence a = F/4m

According to Newton's 3rd law of motion, Fx= Fy
Fx = ma
3m * F/4m
= 3/4 F

11-B
untitled.GIF

12-A
m1u1 + m2u2 = (m1 + m2) v
2(8) + 4(2) = (2+4)v
16 + 8 = 6v
24/6 = v
4 m/s =v

13-D
Both the 20 N forces cancel each other out but the 30 N forces are both in clockwise direction hence resultant force is non zero.
The torque is non zero due to both the 20 N forces.

14-B
Vertical component = 10 000- 9000 = 1000 N

15-A
Air resistance increases over time and the resultant force decreases per unit time due to the opposing resistive force acting on it.

16-C
Basic definition.

17-C
P.E. = mgh
= W*q

18-D
2ad = v^2 - u^2
2a (10) = 0 - 10^2
a = -100/20 = -5 m/s^2

2ad = v^2 - u^2
2(-5) d = 0 - 30^2
d = -900/-10 = 90m

19- B
When the wire is stretched beyond its elastic limit, it will get permanently detached, that is, it won't return to original mean position.
The shapes of the graph need to be learnt.

20- A
untitled.GIF

21-B
Definition: Ultimate tensile stress is the stress at which the material breaks.

22-D
W = k* 3x
k = W/3x

W = ke
W = W/3x *e
3x = e

23-B
Property of transverse waves: They can all be polarised.

24-D
Distance between two successive nodes or two successive anti nodes is half the wavelength.

25-C
All electromagnetic waves travel at the speed of light in vacuum hence speed will be c
and since c = f* lamda
lamda will have to be 2 lamda in order for the value of c to remain constant.

26-B
The time period is 4 boxes on the x axis.
Since 1 box = 2.5 ms, 4 boxes = 4*2.5 = 10 ms
f = 1/T = 1/10*10^-3 =100 Hz

27- C
An interference pattern can be observed in all the conditions except C.

28-C
d sin theta = n* lamda
d = 1*10^-6
n =1 at the angle 70/2 = 35 degrees

1*10^-6 * sin35 = 1* lamda
5.735 *10^-7 = lamda
~ 574 nm

29-B
Formula E =VQ

30- C
Since the total time period = 8s, we use the mean current i.e. (100+20)/2 = 60 mA
Q = It
= 60 * 8
= 480 mC

31-A
Kirchoff's first law is based on law of conservation of charge.

32-B
V = IR
7.5 = I * 15
7.5/15 = I
0.5 A = I

33- B
Total resistance = T1*T2/ (T1 + T2)
T1 = 10 + 6 = 16
T2 = 6 + 10 = 16

T.R. = 16*16/32 = 8 ohms

34- B
Min V = 0/60 * 9 = O V
Max V = 50/60 * 9 = 7.5 V

Range = 0-7.5 V

35-C
Electric field between two parallel plates is always uniform.

36- B
E = V/D = 700/ 5*10^-3 = 140 000

Direction of field is always towards the plate with a lower p.d. [i.e. away from higher charged plate]

37- B
Again the direction is away from positive charge and towards the negative charge.

38- C
The proton no.s are all the same, hence neutrons differ.

39-B
When a beta particle is emitted, nucleon no. remains same and proton no. increases by 1.

40-D

A proton has a charge of +e
So 2(2/3) + 1(-1/3) = 1 e
 
Messages
73
Reaction score
73
Points
18
June 2003

1-B
because mass has magnitude only.

2-B
Work done = Force*distance
kgms^-2 *m = kgm^2 s^-2

3-B
Using cosine rule: c^2 = a^2 + b^2 +2abcosC
c^2 = 10^2 + 10^2 +2(100)cos 120
C = 10 N

4-A
Basic concept that a systematic error can be reduced by checking for zero error.

5-C
because 3% of 330 = 10 m/s
and speed of sound = 330 m/s

6-B
Accuracy: closeness of the measured values to the true value
Precision: closeness of measured values.

7-C

For vertical component: v = u +at
v = usina - gt
and in horizontal component v = u cos a

8-C
In the first 1/3 of the graph, velocity is increasing hence the gradient should be increasing steeply.
In the second 1/3 of the graph, velocity is constant so gradient should be constant, hence a straight line.
In the last 1/3rd of the graph, gradient is decreasing hence line should be least steep.

9-D
because the distance in X is the distance from the ground to the max height after first impact and distance Y is the distance from the max height back to the ground.

10-D

F= ma
Total mass = 4m
hence a = F/4m

According to Newton's 3rd law of motion, Fx= Fy
Fx = ma
3m * F/4m
= 3/4 F

11-B
View attachment 12230

12-A
m1u1 + m2u2 = (m1 + m2) v
2(8) + 4(2) = (2+4)v
16 + 8 = 6v
24/6 = v
4 m/s =v

13-D
Both the 20 N forces cancel each other out but the 30 N forces are both in clockwise direction hence resultant force is non zero.
The torque is non zero due to both the 20 N forces.

14-B
Vertical component = 10 000- 9000 = 1000 N

15-A
Air resistance increases over time and the resultant force decreases per unit time due to the opposing resistive force acting on it.

16-C
Basic definition.

17-C
P.E. = mgh
= W*q

18-D
2ad = v^2 - u^2
2a (10) = 0 - 10^2
a = -100/20 = -5 m/s^2

2ad = v^2 - u^2
2(-5) d = 0 - 30^2
d = -900/-10 = 90m

19- B
When the wire is stretched beyond its elastic limit, it will get permanently detached, that is, it won't return to original mean position.
The shapes of the graph need to be learnt.

20- A
View attachment 12242

21-B
Definition: Ultimate tensile stress is the stress at which the material breaks.

22-D
W = k* 3x
k = W/3x

W = ke
W = W/3x *e
3x = e

23-B
Property of transverse waves: They can all be polarised.

24-D
Distance between two successive nodes or two successive anti nodes is half the wavelength.

25-C
All electromagnetic waves travel at the speed of light in vacuum hence speed will be c
and since c = f* lamda
lamda will have to be 2 lamda in order for the value of c to remain constant.

26-B
The time period is 4 boxes on the x axis.
Since 1 box = 2.5 ms, 4 boxes = 4*2.5 = 10 ms
f = 1/T = 1/10*10^-3 =100 Hz

27- C
An interference pattern can be observed in all the conditions except C.

28-C
d sin theta = n* lamda
d = 1*10^-6
n =1 at the angle 70/2 = 35 degrees

1*10^-6 * sin35 = 1* lamda
5.735 *10^-7 = lamda
~ 574 nm

29-B
Formula E =VQ

30- C
Since the total time period = 8s, we use the mean current i.e. (100+20)/2 = 60 mA
Q = It
= 60 * 8
= 480 mC

31-A
Kirchoff's first law is based on law of conservation of charge.

32-B
V = IR
7.5 = I * 15
7.5/15 = I
0.5 A = I

33- B
Total resistance = T1*T2/ (T1 + T2)
T1 = 10 + 6 = 16
T2 = 6 + 10 = 16

T.R. = 16*16/32 = 8 ohms

34- B
Min V = 0/60 * 9 = O V
Max V = 50/60 * 9 = 7.5 V

Range = 0-7.5 V

35-C
Electric field between two parallel plates is always uniform.

36- B
E = V/D = 700/ 5*10^-3 = 140 000

Direction of field is always towards the plate with a lower p.d. [i.e. away from higher charged plate]

37- B
Again the direction is away from positive charge and towards the negative charge.

38- C
The proton no.s are all the same, hence neutrons differ.

39-B
When a beta particle is emitted, nucleon no. remains same and proton no. increases by 1.

40-D

A proton has a charge of +e
So 2(2/3) + 1(-1/3) = 1 e
thanks a ton!!!!!
 
Messages
1,800
Reaction score
1,800
Points
173
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
untitled.GIF

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
untitled.JPG

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

untitled.JPG

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.
 
Messages
971
Reaction score
532
Points
103
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.
MashAllah this is great. Keep up the awesome work!

(I was about to start with this after about an hour or two, but it's good you did and posted it first. :p)
 
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