Paper for Entry Test Preparation
Physics 1st year Chapter No. 2
Total marks:- 160 Time
allowed 30 minutes
Note:- Fill the appropriate answer of
the following questions in the answer sheet. Double filling and erasing is not
allowed. Each question carries equal marks and for each wrong answer minus one
is awarded.
1) The direction of vector in space required:
a)
X.axis b) X and Y-axis c)
XYZ axis d) Y
and Z axis
2) nĀ has the same direction as that of Ā when n is:
a)
Positive b)
Negative c)
Zero d)
both (a) and (b)
3) Parallel vector of the same magnitude:
a)
are equal b)
are unequal c) When
added give equal d) Non when
multiplied
4) In a triangle OPQ, if Q = 90o and OP
is hypotenuse, then:
a)
(OP)2 = (PQ)2 – (OQ)2 b) (OQ)2 = (OP)2 – (PQ)2 c) (PQ)2 = (OP)2 +
(OQ)2 d) (OQ)2
= (PQ)2 – (OP)2
5) The value of Bx and By is
__ if the vector lies in 2nd quadrant:
a)
-, + b)
+, - c)
+, + d)
-, -
6) If a vector Ā makes an angle Ө with x-axis, then:
a)
Ax = A sin Ө b)
Ax = A cos Ө c)
A = Ax sin Ө d)
A = Ax sin Ө
7) When the magnitude of two component vectors are
equal to that of their resultant, then the angle b/w the component is:
a)
60o b)
90o c)
120o d) 150o
8) The magnitude of a vector Ā = Axi
+ Ayj is given by:
a)
ÖAx2
+ Ay2 b)
Ax2 + Ay2 c) Ax + Ay d) Non of these
9) All trigonometric functions (sine, cosine,
tangent etc) are positive in:
a)
1st quadrant b)
2nd quadrant c)
3rd quadrant d)
4th quadrant
10) Two forces each of magnitude F act perpendicular
to each other, the angle made by resultant with x-axis is:
a)
30o b)
45o c)
60o d)
90o
11) If displacement of body is Ā = 3î, its only
significance is:
a)
The displacement of 3 units along Y-axis b)
The displacement of 3 units along Z-axis
c)
The displacement of 3 units along X-axis d)
Non of all
12) The magnitude of resultant of 3 vectors is 3,
its x component is one, y component is two, then z-component is:
a)
zero b)
1 c)
2 d) 3
13) The magnitude of resultant of two vectors having
magnitudes 3.5 N and 2.5 N is:
a)
1.0 N b)
6 N c)
3.5 N d)
12 N
14) The unit vector of vector Ā of magnitude 2 is:
a)
2 Ā b)
2 + Ā c) Ā
/2 d)
2 – Ā
15) Which of the following represents the modulus
of a position vector whose components are Ö2i,
Ö2j and
Ö2k:
a)
3Ö2 b) Ö2/3 c)
Ö6 d) 2Ö2
16) The two each of 9N are acting on a body in the
east and north direction, the direction of resultant will be:
a)
North-east b)
North-west c)
South-east d)
Non of all
17) Choose the correct pair:
a) i x j
= k, j x i = 0 b) j x k = 1, j . k
= 0 c) k . i
= 0, k x i = -j d) k x i = 0, k . i
= 0
18) Ā x B = ABn
if angle b/w these vectors are:
a)
0o b) 30o c) 60o d) 90o
19) If Ā = j
+ k and B = - j – k, then the angle b/w
the vectors is:
a)
90o b)
180o c) 270o d) 360o
20) If the dot product of two non zero vectors Ā and
B is zero, the magnitude of their cross product will be:
a)
AB
b)
AB sin Ө c) AB
cos Ө d) Zero
21) The property Ā . B = B. Ā is called:
a)
Associative b)
Multiplicative c)
Commutative d) Non
of these
22) If Ā = 2i
+ 3k and B = 9i + j then Ā . B =
a)
21 units b)
18 units c)
22 units d)
16 units
23) The two vectors 5i – j – 2k and i + Qj + k
are perpendicular to each other when the value of Q is:
a)
3 b)
4 c)
5 d)
2
24) The answers to i x j and k x i respectively are:
a)
0, +k b)
–k, k c)
0, -k d)
Non of these
25) The magnitude of i . (j x k) is:
a)
1 b) 0 c) -1 d) 2k
26) If C = 3i
– 5j + 7k and D = -2k, then C x D
is:
a)
10i + 6j b) 6i
+ 10j c)
6j + 10k d) 6i
+ 10j – 14k
27) Magnitude of torque acting on a body determines:
a)
Linear acceleration b)
Angular momentum c) Mass d) Moment arm
28) By convention, torques producing clock-wise
rotation are takne as:
a)
Positive b)
Negative c)
Zero d)
Non of these
29) For a body to be in complete equilibrium,
following condition should by satisfied:
a)
SFx
= 0 b) SFy = 0 c) St = 0 d)
All of above
30) Which of the following is a correct statement:
a)
Torque is a vector quantity b)
Torque is the turning effect of a force
c)
Torque is called moment of a force d) All of above
31) If two non-zero vector A and B are
perpendicular to each other, then:
a)
A . B = AB b)
|A x B| = AB c)
|A x B| = 0 d)
Non of all
32) In the formula A . B = AB cos Ө:
a)
Vector A is called the projection of vector B b)
B cos Ө is called the projection of vector B on A
c)
A cod Ө is called projection of vector B on A d)
Non of these
33) If the two vectors A and B are such that |A x B|
= |A x B|, then the angle b/w A and B will be:
a)
0o b)
60o c)
90o d)
180o
34) Two vectors having different magnitudes:
a)
have in opposite direction b) may have
resultant zero c) can’t have
resultant zero d) Non of all
35) Unit vector is used to specify:
a)
magnitude of a vector b)
dimension of a vector c)
direction of a vector d)
position of a vector
36) Null vector is a vector having zero magnitude
and:
a)
No direction b)
Specific direction c)
Arbitrary direction d) Non
of all
37) When a vector is multiplied by a negative
number, its direction:
a)
remain the same b)
changes by 90o c)
changes by 180o d)
Non of these
38) The position vector of a point in YZ plane is
given by:
a)
r = xj + yk b) r
= xi + yk c)
r = yj + zk d) r
= yk + zk
39) Which of the following is a scalar quantity:
a)
electric potential b) velocity c) momentum d) force
40) If a vector 5N lies along x-axis, then its
component along y-axis will be:
a)
Zero b)
5 N c)
2.5 N d)
10 N
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