JEE Physics Motion In A Plane MCQs Set 22

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Chapter-wise Objective Questions: Motion In A Plane

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Multiple Choice Questions

Question 1: While I travel east at 10 km/h, a train moving with constant velocity appears to move exactly north-east. When my velocity is increased to 30 km/h east, it appears to move exactly north. With what speed should I move towards the north so that the train appears to move exactly south-east?
(a) 50 km/h
(b) 30 km/h
(c) 20 km/h
(d) 10 km/h
Show Answer & Explanation

Answer: (a) 50 km/h

Explanation:
1. Let the train velocity be \( (x,y) \). For my velocity 10 east, the relative velocity \( (x-10,\,y) \) is north-east, so \( x-10=y \).
2. For my velocity 30 east, the relative velocity \( (x-30,\,y) \) is north, so \( x=30 \). Hence \( y=20 \), and the train velocity is \( (30,20) \) km/h.
3. If I move north with speed s, the relative velocity is \( (30,\,20-s) \). For south-east the components must be equal and opposite: \( 20-s=-30 \), so \( s=50 \) km/h.

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Question 2: It is found that \( |\vec A+\vec B|=|\vec A| \). This necessarily implies that:
(a) \( \vec B=0 \)
(b) \( \vec A\cdot\vec B\le 0 \)
(c) \( \vec A \) and \( \vec B \) are anti-parallel
(d) \( \vec A \) and \( \vec B \) are perpendicular
Show Answer & Explanation

Answer: (b) \( \vec A\cdot\vec B\le 0 \)

Explanation:
1. Square both sides: \( A^2+B^2+2\vec A\cdot\vec B=A^2 \).
2. So \( \vec A\cdot\vec B=-\tfrac12B^2 \).
3. Since \( B^2\ge0 \), the dot product is never positive: \( \vec A\cdot\vec B\le0 \). It is zero only when \( \vec B=0 \), so B need not be zero, perpendicular or anti-parallel.

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Question 3: Two vectors \( \vec a \) and \( \vec b \) are such that \( \vec a+\vec b \) is in the same direction as \( \vec a-\vec b \). Then:
(a) \( \vec a\cdot\vec b=0 \) must be true
(b) \( |\vec a|<|\vec b| \) must be true
(c) \( \vec a\times\vec b=0 \) and \( |\vec a|>|\vec b| \) must both be true
(d) \( \vec a\times\vec b=0 \) is true but \( |\vec a|>|\vec b| \) need not be
Show Answer & Explanation

Answer: (c) \( \vec a\times\vec b=0 \) and \( |\vec a|>|\vec b| \) must both be true

Explanation:
1. Same direction means \( \vec a+\vec b=k(\vec a-\vec b) \) with \( k>0 \), so \( (1-k)\vec a=-(1+k)\vec b \). Hence \( \vec a\) and \( \vec b \) are parallel and \( \vec a\times\vec b=0 \).
2. Write \( \vec a=\lambda\vec b \). Then \( \vec a+\vec b=(\lambda+1)\vec b \) and \( \vec a-\vec b=(\lambda-1)\vec b \); they point the same way only if \( (\lambda+1)(\lambda-1)>0 \), i.e. \( |\lambda|>1 \).
3. So \( |\vec a|>|\vec b| \) as well. Both conditions hold together.

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Question 4: A unit vector \( \hat a \) is along an incident light ray, \( \hat b \) is a unit vector along the refracted ray in a medium of refractive index x (relative to the first medium), and \( \hat c \) is a unit vector normal to the boundary directed towards the first medium. The law of refraction in vector form is:
(a) \( \hat a\cdot\hat c=x(\hat b\cdot\hat c) \)
(b) \( \hat c\times\hat a=x(\hat b\times\hat c) \)
(c) \( x(\hat a\times\hat c)=\hat b\times\hat c \)
(d) \( \hat a\times\hat c=x(\hat b\times\hat c) \)
Show Answer & Explanation

Answer: (d) \( \hat a\times\hat c=x(\hat b\times\hat c) \)

Explanation:
1. Snell's law with relative index x gives \( \sin i=x\sin r \).
2. The magnitudes are \( |\hat a\times\hat c|=\sin i \) and \( |\hat b\times\hat c|=\sin r \).
3. Incident and refracted rays bend on the same side of the normal, so both cross products have the same direction. Hence \( \hat a\times\hat c=x(\hat b\times\hat c) \).

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Question 5: A vector \( \vec C \) is the resultant of two vectors \( \vec A \) and \( \vec B \) (its components). The line of \( \vec C \) is horizontal; \( \vec A \) makes 30 degrees below it and \( \vec B \) makes 45 degrees above it. Then the magnitude of A is:
(a) \( A=\frac{2C}{\sqrt3+1} \)
(b) \( A=\frac{\sqrt3}{2}C \)
(c) \( A=\frac{C}{\sqrt2} \)
(d) \( A=\sqrt2(\sqrt3-1)C \)
Show Answer & Explanation

Answer: (a) \( A=\frac{2C}{\sqrt3+1} \)

Explanation:
1. Components perpendicular to C must cancel: \( A\sin30^\circ=B\sin45^\circ \), so \( A=\sqrt2\,B \).
2. Components along C add up to C: \( A\cos30^\circ+B\cos45^\circ=C \), i.e. \( \sqrt2B\cdot\frac{\sqrt3}{2}+\frac{B}{\sqrt2}=C \).
3. \( B=\frac{\sqrt2\,C}{\sqrt3+1} \) and therefore \( A=\sqrt2B=\frac{2C}{\sqrt3+1}=(\sqrt3-1)C \).

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Question 6: In a parallelogram ABCD, \( |\overrightarrow{AB}|=a \), \( |\overrightarrow{AD}|=b \) and \( |\overrightarrow{AC}|=c \). The value of \( \overrightarrow{DB}\cdot\overrightarrow{AB} \) is:
(a) \( \frac{2a^2+b^2-c^2}{2} \)
(b) \( \frac{3a^2+b^2-c^2}{2} \)
(c) \( \frac{a^2+3b^2-c^2}{2} \)
(d) \( \frac{a^2+b^2+3c^2}{2} \)
Show Answer & Explanation

Answer: (b) \( \frac{3a^2+b^2-c^2}{2} \)

Explanation:
1. \( \overrightarrow{AC}=\overrightarrow{AB}+\overrightarrow{AD} \) gives \( c^2=a^2+b^2+2\,\overrightarrow{AB}\cdot\overrightarrow{AD} \), so \( \overrightarrow{AB}\cdot\overrightarrow{AD}=\frac{c^2-a^2-b^2}{2} \).
2. \( \overrightarrow{DB}=\overrightarrow{AB}-\overrightarrow{AD} \), so \( \overrightarrow{DB}\cdot\overrightarrow{AB}=a^2-\overrightarrow{AB}\cdot\overrightarrow{AD} \).
3. \( =a^2-\frac{c^2-a^2-b^2}{2}=\frac{3a^2+b^2-c^2}{2} \).

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Question 7: Two forces P and Q are in the ratio 1 : 2. Their resultant makes an angle \( \tan^{-1}\left(\frac{\sqrt3}{2}\right) \) with P. The angle between P and Q is:
(a) 30°
(b) 45°
(c) 60°
(d) \( \tan^{-1}\frac12 \)
Show Answer & Explanation

Answer: (c) 60°

Explanation:
1. Take P = 1 and Q = 2 with angle \( \theta \) between them. The resultant makes angle \( \alpha \) with P where \( \tan\alpha=\frac{Q\sin\theta}{P+Q\cos\theta}=\frac{2\sin\theta}{1+2\cos\theta} \).
2. Set this equal to \( \frac{\sqrt3}{2} \). Try \( \theta=60^\circ \): \( \frac{2(\sqrt3/2)}{1+1}=\frac{\sqrt3}{2} \).
3. The expression increases steadily for small angles and is uniquely satisfied there, so \( \theta=60^\circ \).

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Question 8: Three forces of magnitudes F1, F2 and F3 act on a particle of mass 2 kg. Which statements are correct? (I) For 2 N, 3 N, 4 N the particle can move with constant velocity. (II) For 1 N, 3 N, 5 N the particle can have an acceleration of 3 m/s². (III) For 2 N, 3 N, 4 N the particle can have an acceleration of 5 m/s². (IV) For 2 N, 3 N, 4 N the particle can have an acceleration of 2 m/s².
(a) I and III only
(b) II, III and IV only
(c) I, II and III only
(d) I, II and IV only
Show Answer & Explanation

Answer: (d) I, II and IV only

Explanation:
1. For 2, 3, 4 N: three vectors can sum to zero because 4 is less than 2 + 3, and the largest possible net force is 9 N. So the net force ranges from 0 to 9 N and the acceleration from 0 to 4.5 m/s². (I) and (IV) are possible, (III) is not (it needs 10 N).
2. For 1, 3, 5 N: the minimum net force is 5 - (1+3) = 1 N and the maximum is 9 N. An acceleration of 3 m/s² needs 6 N, which lies in the range, so (II) is possible.

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Question 9: If \( \vec a=\hat i+\hat j+\hat k \), \( \vec a\cdot\vec b=1 \) and \( \vec a\times\vec b=\hat j-\hat k \), then \( \vec b \) is:
(a) \( \hat i \)
(b) \( \hat i-\hat j+\hat k \)
(c) \( \hat i+\hat j-\hat k \)
(d) \( 2\hat i \)
Show Answer & Explanation

Answer: (a) \( \hat i \)

Explanation:
1. Let \( \vec b=(b_1,b_2,b_3) \). Then \( b_1+b_2+b_3=1 \).
2. \( \vec a\times\vec b=(b_3-b_2,\ b_1-b_3,\ b_2-b_1)=(0,1,-1) \), so \( b_3=b_2 \), \( b_1=1+b_2 \).
3. Substituting in the dot product: \( 1+3b_2=1 \), so \( b_2=0 \), and \( \vec b=\hat i \).

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Question 10: A river flows with a speed of 1 km/h. A swimmer starts from point A on one bank and wants to reach point C on the opposite bank, where B is the point directly opposite A and C is 400 m downstream of B (AB = BC = 400 m). He swims with speed 5 km/h relative to water at angle \( \theta \) with the direction of the river flow (sin 53 degrees = 4/5). The angle \( \theta \) and the time taken are:
(a) \( \theta=53^\circ \), time 8 min
(b) \( \theta=53^\circ \), time 6 min
(c) \( \theta=45^\circ \), time 6 min
(d) \( \theta=45^\circ \), time 8 min
Show Answer & Explanation

Answer: (b) \( \theta=53^\circ \), time 6 min

Explanation:
1. To go from A to C the resultant velocity must be at 45 degrees to the bank (AB = BC), so its components along and across the river are equal: \( 5\cos\theta+1=5\sin\theta \).
2. For \( \theta=53^\circ \): \( 5(0.6)+1=4=5(0.8) \). So \( \theta=53^\circ \).
3. Time \( =\frac{AB}{5\sin\theta}=\frac{0.4\ \text{km}}{4\ \text{km/h}}=0.1 \) h \( =6 \) min.

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Question 11: Let \( \vec a,\vec b,\vec c \) be unit vectors such that \( \vec a+\vec b+\vec c=0 \). Which one of the following is correct?
(a) \( \vec a\times\vec b=\vec b\times\vec c=\vec c\times\vec a=0 \)
(b) \( \vec a\times\vec b=\vec b\times\vec c=\vec a\times\vec c\ne0 \)
(c) \( \vec a\times\vec b=\vec b\times\vec c=\vec c\times\vec a\ne0 \)
(d) \( \vec a\times\vec b,\ \vec b\times\vec c,\ \vec c\times\vec a \) are mutually perpendicular
Show Answer & Explanation

Answer: (c) \( \vec a\times\vec b=\vec b\times\vec c=\vec c\times\vec a\ne0 \)

Explanation:
1. Since \( \vec c=-\vec a-\vec b \): \( \vec a\times\vec b \) and \( \vec b\times\vec c=\vec b\times(-\vec a-\vec b)=\vec a\times\vec b \).
2. Similarly \( \vec c\times\vec a=(-\vec a-\vec b)\times\vec a=\vec a\times\vec b \). So all three are equal.
3. The vectors are at 120 degrees to each other, so the common value has magnitude \( \sin120^\circ\ne0 \).

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Question 12: If \( \vec a,\vec b,\vec c \) are three unit vectors such that \( \vec a+\vec b+\vec c=0 \), then \( \vec a\cdot\vec b+\vec b\cdot\vec c+\vec c\cdot\vec a \) is equal to:
(a) -1
(b) 3
(c) 0
(d) -3/2
Show Answer & Explanation

Answer: (d) -3/2

Explanation:
1. Square the sum: \( |\vec a+\vec b+\vec c|^2=0 \).
2. \( 1+1+1+2(\vec a\cdot\vec b+\vec b\cdot\vec c+\vec c\cdot\vec a)=0 \).
3. So the required sum is \( -\tfrac32 \).

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Question 13: In a given coordinate system a vector is \( \vec A=3\hat j+4\hat k \). In another coordinate system, chosen arbitrarily, \( \vec A \) cannot be:
(a) \( 5(\hat i+\hat j) \)
(b) \( 5\hat i \)
(c) \( 5\hat j \)
(d) \( \frac52(\hat i+\sqrt3\hat j) \)
Show Answer & Explanation

Answer: (a) \( 5(\hat i+\hat j) \)

Explanation:
1. A vector has the same magnitude in every coordinate system. Here \( |\vec A|=\sqrt{9+16}=5 \).
2. Check the options: \( |5\hat i|=5 \), \( |5\hat j|=5 \), \( \left|\tfrac52(\hat i+\sqrt3\hat j)\right|=\tfrac52\cdot2=5 \), but \( |5(\hat i+\hat j)|=5\sqrt2 \).
3. So \( 5(\hat i+\hat j) \) is impossible.

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Question 14: Four vectors satisfy \( \vec a+\vec b+\vec c+\vec d=0 \). In Case 1, \( |\vec a|=3,\ |\vec b|=5,\ |\vec c|=6 \). In Case 2, \( |\vec a|=1,\ |\vec b|=4,\ |\vec c|=7 \). The maximum magnitude of \( \vec d \) in Case 1 and the minimum magnitude of \( \vec d \) in Case 2 are respectively:
(a) 14 and 0
(b) 14 and 2
(c) 12 and 2
(d) 12 and 0
Show Answer & Explanation

Answer: (b) 14 and 2

Explanation:
1. \( \vec d=-(\vec a+\vec b+\vec c) \), so \( |\vec d| \) is the magnitude of the sum of three vectors.
2. Case 1: the maximum is \( 3+5+6=14 \) (all parallel).
3. Case 2: the largest vector 7 exceeds the sum of the other two (1 + 4 = 5), so the minimum is \( 7-5=2 \).

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Question 15: Which of the following sets of numbers can represent the magnitudes of three vectors adding to zero?
(a) 2, 4, 8
(b) 4, 8, 16
(c) 1, 2, 1
(d) 0.5, 1, 2
Show Answer & Explanation

Answer: (c) 1, 2, 1

Explanation:
1. Three vectors can add to zero if the largest magnitude does not exceed the sum of the other two.
2. 2, 4, 8: 8 > 6. 4, 8, 16: 16 > 12. 0.5, 1, 2: 2 > 1.5. None of these works.
3. 1, 2, 1: 2 = 1 + 1, which is possible when the two unit vectors are parallel and the third is opposite.

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Question 16: Two time-dependent vectors are \( \vec a=8t\,\hat i-t^2\hat j \) and \( \vec b=t^2\hat i+2\hat j \) (t > 0, in seconds). At what time do they become perpendicular?
(a) 4 s
(b) 2 s
(c) 1/2 s
(d) 1/4 s
Show Answer & Explanation

Answer: (d) 1/4 s

Explanation:
1. Perpendicular means \( \vec a\cdot\vec b=0 \): \( 8t\cdot t^2-t^2\cdot2=0 \).
2. \( 8t^3-2t^2=0 \Rightarrow 2t^2(4t-1)=0 \).
3. For t > 0 this gives \( t=\tfrac14 \) s. (They are never parallel for t > 0, since \( \vec a\times\vec b \) has magnitude \( 16t+t^4>0 \).)

Teacher's Note:
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Question 17: A vector \( \overrightarrow{OA}=3\hat i \) is rotated through an angle \( \theta \) about its starting point O in the x-z plane, in the clockwise sense as seen by an observer located on the +y axis. The new vector is:
(a) \( 3\cos\theta\,\hat i+3\sin\theta\,\hat k \)
(b) \( 3\cos\theta\,\hat i+3\sin\theta\,\hat j \)
(c) \( 3\cos\theta\,\hat i-3\sin\theta\,\hat k \)
(d) \( 3\sin\theta\,\hat i-3\cos\theta\,\hat k \)
Show Answer & Explanation

Answer: (a) \( 3\cos\theta\,\hat i+3\sin\theta\,\hat k \)

Explanation:
1. A rotation anticlockwise as seen from +y is a positive rotation about the y-axis (right-hand rule), and it takes \( \hat z \) towards \( \hat x \), so it takes \( \hat x \) towards \( -\hat z \).
2. Clockwise as seen from +y is the opposite sense, so \( \hat x \) turns towards \( +\hat z \).
3. The new vector is \( 3\cos\theta\,\hat i+3\sin\theta\,\hat k \), and it stays in the x-z plane.

Teacher's Note:
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Question 18: Two cars move on two mutually perpendicular straight roads towards a crossing. Car A moves with 10 m/s and is 1500 m from the crossing; car B moves with 15 m/s and is 1800 m from the crossing at the same instant. After how long are they closest to each other?
(a) 109.3 s
(b) 129.2 s
(c) 119.3 s
(d) 99.3 s
Show Answer & Explanation

Answer: (b) 129.2 s

Explanation:
1. At time t the distances from the crossing are \( 1500-10t \) and \( 1800-15t \), so \( d^2=(1500-10t)^2+(1800-15t)^2 \).
2. For the minimum, \( \frac{d(d^2)}{dt}=0 \): \( -10(1500-10t)-15(1800-15t)=0 \), i.e. \( 325t=42000 \).
3. \( t=\frac{42000}{325}\approx129.2 \) s (both cars have still not reached the crossing at this time).

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Question 19: A unit vector perpendicular to both \( \vec A=2\hat i+3\hat j+\hat k \) and \( \vec B=\hat i-\hat k \) is:
(a) \( \frac{1}{\sqrt{42}}(4\hat i-\hat j-5\hat k) \)
(b) \( \frac{1}{42}(4\hat i-\hat j-5\hat k) \)
(c) \( \frac{1}{\sqrt3}(-\hat i+\hat j-\hat k) \)
(d) \( \frac{1}{42}(\hat i-\hat j+5\hat k) \)
Show Answer & Explanation

Answer: (c) \( \frac{1}{\sqrt3}(-\hat i+\hat j-\hat k) \)

Explanation:
1. \( \vec A\times\vec B=\begin{vmatrix}\hat i&\hat j&\hat k\\2&3&1\\1&0&-1\end{vmatrix}=-3\hat i+3\hat j-3\hat k \).
2. Its magnitude is \( \sqrt{27}=3\sqrt3 \).
3. The unit vector is \( \frac{1}{\sqrt3}(-\hat i+\hat j-\hat k) \) (the negative of this is also valid).

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Question 20: A particle moving eastwards with 5 m/s changes its velocity in 10 s to 5 m/s northwards. The average acceleration in this time is:
(a) \( \frac{1}{\sqrt2} \) m/s² towards north-east
(b) \( \frac12 \) m/s² towards north
(c) Zero
(d) \( \frac{1}{\sqrt2} \) m/s² towards north-west
Show Answer & Explanation

Answer: (d) \( \frac{1}{\sqrt2} \) m/s² towards north-west

Explanation:
1. \( \Delta\vec v=\vec v_f-\vec v_i=5\hat j-5\hat i \), which has magnitude \( 5\sqrt2 \) and points north-west.
2. \( a_{avg}=\frac{5\sqrt2}{10}=\frac{1}{\sqrt2} \) m/s² towards north-west.

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Motion In A Plane Objective Questions & Solutions for JEE Physics

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