Physics chapter 1 to 3 entry test prepration

For Group:write correct option with mcq number in a single comment.
Choose the correct option:
1)A door is opened clockwise direction then torque is in:
(a)Clock wise (b)upward (c)downward (d)anti clock wise
2)if a simple pendulum has length L which makes angle θ with the horizontal,then torque prodused will be
(a)mgL sinθ (b)mgLθ (c)mgsinθ (d)mgLcosθ
3)The states of equilibrium are:
(a)2 (b)3 (c)4 (d)5
4)At what angle F×r=r×F
(a)0 (b)180 (c)both a and b (d)none
5)when net torque is zero,then which quantity remains constant:
(a)Angular velocity (b)Linear momentum (c)angular momentum (d)Both a and b
6)A force of 12N gives an object an acceleration of 4ms-2 ,the force required it to produce acceleration of 10ms-2 in it:
(a)15N (b)20N (c)25N (d)30N
7)When an object is in unstable equilibrium then its,
(a)C.G falls (b)C.G rise (c)P.E decreases (d) both a and c
8)The rate of change of momentum for free falling object is
(a)mg (b)greater than mg (c)zero (d)all
9)anti clockwise torque is taken as
(a)positive (b)negative (c)zero (d)maximum
10)A ceiling fan is at equilibrium at the instant when
(a)switch has just ON (b)switch has just made off (c)Rotating at const.speed (d)all time
11)Which law of motion defines force
(a)1st (b)2nd (c)3rd (d)all
12)a stone has mass of 40g.its weight is
(a)0.004N (b)40N (c)0.039N (d)0.392N
13)if the gravitational mass of a body on earth is M then mass on moon will be
(a)M (b)6M (c)M/6 (d)2.4M
14)torque in a uniformly rotating fan is equal to
(a)rF (b)zero (c)rF sinθ (d)maximum
15)At what depth of earth the value of g reduces to half of its value on the surface of earth
(a)R (b)R/2 (c)R/4 (d)4R
16)if an object is thrown downward then value of g just after releasing the object will be
(a)equal to 9.8 (b)less than 9.8 (c)greater than 9.8 (d)none
17)the weight of an object is determined by
(a)Physical balance (b)spring balance (c)torsional balance (d)all
18)if a person moves from equator to pole its mass
(a)increases (b)decreases (c)first increase then decrease (d)remains same
19)the weight of an object when taken to the top of a mountain
(a)increases (b)decreases (c)remains same (d)may increase may decrease
20)the angle b/w r×F and -F×r is
(a)180 (b)60 (c)45 (d)0
21)weight is a
(a)mass (b)momentum (c)force (d)torque
22)torque is analogue force for
(a)translational motion (b)circular motion (c)vibratory motion (d)linear motion
23)real and apparent weight become equal in:
(a)inertial frame (b)frame moving with uniform velocity (c)static frame (d)all
24)which of the following is least multiple
(a)deca (b)peta (c)micro (d)deci
25)if p is the momentum of object and m is the mass then the expression p2/2m has base unit identical to
(a)energy (b)force (c)power (d)velocity
26)which of the following have same dimensions but different units:
(a)torque,torsional couple (b)frequency,angular speed (c)plane angle,solid angle (d)all
27)the dimension of decay constant is same as:
(a)time period (b)frequency (c)angular velocity (d)both b and c
28)watt day is the unit of
(a)energy (b)power (c)momentum (d)time
29)the ratio of dimensions of plane angle and solid angle is:
(a)2:1 (b)1:1 (c)1:2 (d)4:1
30)non accelerated frame of reference is called
(a)non inertial (b)inertial (c)closed (d)open
31)which of the following is dimension less quantity
(a)momentum/acceleration (b)energy/work (c)volume/area (d)power/force
32)the ratio of inertial mass and gravitational mass is:
(a)1:1 (b)2:1 (c)1:2 (d)-1:1
33)the dimension of entropy is same as that of
(a)heat (b)Boltzmann constant (c)stephen’s Constant (d)power
34)which of the following has smallest magnitude:
(a)one meter (b)one milimeter (c)one fermi (d)one angstrom unit
35)N/kg is unit of
(a)velocity (b)momentum (c)acceleration (d)angular momentum
36)electric current can be expressed as a derived quantity in terms of:
(a)length and mass (b)length ,mass and time (c)mass and time (d)none
37)intensity of gravitational field strength is maximum at
(a)centre of earth (b)the poles (c)the equator (d)outside the atmosphere
38)1/pV2 has same unit as
(a)energy (b)P.E (c)k.E (d)pressure
39)physical quantities can be added only if they have
(a)same dimensions (b)different dimensions (c)both (d)none
40)the ratio of SI units to CGS units of gravitational constant G will be:
(a)10-3 (b)10 (c)102 (d)103
41)which of the following is dimensionally correct for pressure:
(a)equals energy per unit area (b)equals energy per unit volume (c)equals force per unit volume (d)equals momentum per unit volume per unit time
42)the dimensions of 1/2at2 are of
(a)length (b)velocity (c)acceleration (d)time
43)which of the following is not measured in units of energy
(a)couple(angle turned through) (b)moment of inertia(angular velocity)2 (c)force(distance) (d)force(time)
44)the dimensions of velocity gradient are same as that of
(a)frequency (b)time period (c)angular accelerations (d)aacelerations
45)two spheres of equal masses but radii R and 2R are allowed to fall in a liquid ,the ratio of their terminal velocities is:
(a)2:1 (b)1:4 (c)1:2 (d)1:32
46) The dimensional formula of magnetix field strength or induction is
(a)MT-2A-1 (b)M-1T-1A-1 (c)MLT-2 (d)ML-1T-2
47)Ratio of dimensions of power and K.E is:
(a)1:1 (b)T:1 (c)1:T (d)M:T
48)the relative velocity of a particle moving with velocity V w.r.t itself is:
(a)zero (b)V (c)-V (d)None
49)newton’s 1st law of motion defines:
(a)mass (b)force (c)acceleration (d)speed
50)the numerical ratio of velocity to speed is:
(a)less than 1 (b)less than zero (c)greater than 1 (d)either less than or equal to 1
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