Q.1.
Joule × sec is the unit of .. [ CPMT 1990]
-
20%
a) Momentum
-
20%
b) Energy
-
10%
c) Angular Velocity
-
50%
d) Plank's constant
Q.2.
Which of the following quantities can be written in SI unit in kgm2A-2s-3?
-
33%
a) Resistance
-
33%
b) Inductance
-
17%
c) Capacitance
-
17%
d) Magnetic flux
Q.3.
If unit of length, mass and force are chosen as fundamental units, the dimensions of time would be
-
17%
a) M1/2L-1/2F1/2
-
33%
b) M1/2L1/2F1/2
-
33%
c) M1/2 L1/2F-1/2
-
17%
d) M L-1/2F-1/2
Q.4.
Dimensions of L / (RCV) are .. [ Roorkee, 1994]
-
25%
a) A-1
-
25%
b) A-2
-
25%
c) A
-
25%
d) A2
Q.5.
Which of the following has the dimension of pressure? [C.P.M.T 1994]
-
0%
a) ML/ T2
-
40%
b) M/ (L2T2)
-
60%
c) M / LT2
-
0%
d) M/LT
Q.6.
In an experiment to measure the height of a bridge b dropping stone into water underneath, if error in measurement of time is 0.1s at the end of 2s, then the error in estimation of height of bridge will be [ kerala P.E.T. 2004]
-
50%
a) 0.49m
-
50%
b) 0.98m
-
0%
c) 1.96m
-
0%
d) 2.12m
Q.7.
Two quantities A and B have different dimensions. Which mathematical operation may be physically meaningful [ C.P.M.T. 1998]
-
43%
a) A/B
-
43%
b) A+B
-
0%
c) A-B
-
14%
d) A=B
Q.8.
When a copper sphere is heated, maximum percentage change will be observed in.. [ AFMC 2003]
-
17%
a) radius
-
0%
b) area
-
67%
c) volume
-
17%
d) none of these
Q.9.
If L = 2.251 cm, B = 2.1 cm, then with reference to significant digit L+B = ....
-
11%
a)4.351
-
56%
b) 4.35
-
33%
c) 4.4
-
0%
d) 4 cm
Q.10.
The ratio of the dimension of Planks constant and that of moment of inertia is the dimension of [ C.B.S.E. PMT 2005]
-
12%
a) velocity
-
38%
b) angular momentum
-
38%
c) time
-
12%
d) frequency
Q.11.
A physical quantity A is related to four observables a,b,c,d as follows the percentage of error of measurement is a,b,c,d are 1, 3, 2 and 2 respectively. What is the percentage error in A? [ kerala C.E.T 2005]
-
17%
a) 12%
-
17%
b) 7%
-
67%
c) 14%
-
0%
d) 16%
Explanation
Q.12.
The dimensional formula of magnetic flux is .. [ CBSE-PMT 1999]
-
50%
a) [ML2T-2A-1]
-
0%
b) [ML0T-2A-2]
-
25%
c) [M0L-2T-2A-2]
-
25%
d) [ML2T-1A3]
Q.13.
Length cannot be measured in [ AIIMS 2002]
-
17%
a) fermi
-
0%
b) micron
-
33%
c) debye
-
50%
d) light year
Q.14.
Dimensional formula for electrical resistance is [ AIIMS 2005]
-
0%
a) ML2T-3A-1
-
50%
b) ML2T-3A-2
-
25%
c) ML2T3A-2
-
25%
d) ML-1T3A2
Q.15.
Which of the following systems of units is not based on the units of mass, length and time alone? [ keral P.M.T 2004]
-
83%
a) S.I.
-
0%
b) MKS
-
0%
c) FPS
-
17%
d) CGS
Q.16.
Chronometer is used to measure [ A.F.M.C 2003]
-
40%
a) time
-
20%
b) mass
-
0%
c) density
-
40%
d) distance
Q.17.
Si unit of magnetic dipole moment is [ MPPMT 2002]
-
33%
a) Am-1
-
33%
b) A m2
-
0%
c) T mA-1
-
33%
d) mA-2
Q.18.
In the standard equation Sn = u +(a/2)[2n-1], what dimension do you view for Sn?
-
67%
a) M0L1T0
-
0%
b) M0L-1T1
-
33%
c) M0L1T-1
-
0%
d) M0L0T1
Q.19.
The length of rod a rod is (11.05±0.05)cm. What is the total length of 2 such rods?
-
0%
a) (22.1 ±0.05)cm
-
40%
b) (22.10±0.05)cm
-
20%
c) (22.10±0.05)cm
-
40%
d) (22.10±0.10)cm
Q.20.
A unit less quantity
-
17%
a) may have a non-zero dimension
-
0%
b) always have a non-zero dimension
-
33%
c) never has a non-zero dimension
-
50%
d) does not exist
Q.21.
The length and breadth of metal sheet are 3.124m and 3.002m respectively. The area of this sheet up to four correct significant figure is [ AIIMS 2001]
-
0%
a) 9.37 m2
-
60%
b) 9.378m2
-
20%
c) 9.3782 m2
-
20%
d) 9.378248 m2
Q.22.
Out of following pairs, which does not have identical dimensions [ AIEE 2005]
-
0%
a) Work and torque
-
0%
b) moment of inertia and moment of a force
-
25%
c) impulase and momentum
-
75%
d) anular moment and plank's constant
Q.23.
Power P is related to distance x and time t as The dimensional formula of b is
-
0%
a) [M0LT-2
-
0%
b) [M0L2T2
-
17%
c) [M0L2T-2
-
83%
d) [M0L2T0
Q.24.
Subtract 2.6×104 from 3.9×105 with due regards to significant figures
-
0%
a) 3.64×105
-
50%
b) 3.7×105
-
25%
c) 3.6 ×105
-
25%
d) 3.65 ×106
Q.25.
Add 3.8 ×10-6 to 4.2 ×10-5 with due regards to significant figure
-
33%
a) 4.6 ×10-5
-
0%
b) 4.6 ×10-6
-
67%
c) 4.58 ×10-5
-
0%
d) 4.580 ×10-5
Q.26.
pressure depends on distance as Where α, β are constant, z is distance, k is Boltzman's constant and θ is temperature. the dimension of β are [ IIT 2004]
-
100%
a) M0L0T0
-
0%
b) M-1L-1T-1
-
0%
c) M0L2T0
-
0%
d) M1L1T2
Explanation
Q.27.
Which of the following is the dimensional formula for the energy per unit area per second
-
0%
a) [ ML0T0]
-
0%
b) [ ML0T-3]
-
0%
c) [ ML2T-1]
-
100%
d) [ ML0T1]
Q.28.
If p is radiation pressure, C represents speed of light and Q represents radiation energy striking unit area per sond, then non zero integers x, y, and z such that PxQyCz is dimensionless are [CPMT 1992]
-
33%
a) x=1, y =1, z=-1
-
0%
b) x=1, y = -1, z=1
-
0%
c) x=-1, y=1, z=1
-
67%
d) x=1, y=1,z=1
Explanation
Q.29.
A pressure of 106 dyne/cm2 is equivalent to ..
-
0%
a) 105 N / m2
-
0%
b) 104 N / m2
-
50%
c) 106 N / m2
-
50%
d) 107 N / m2
Explanation
Q.30.
the mass of a beaker is found to be (10.1±0.1) gm when empty and (17.3±0.1)gm when partially filled with a liquid. What is the best value for the mass of the liquid together with the possible limits of accuracy
-
0%
a) (7.2±0.2)gm
-
50%
b) (7.2±0.1)gm
-
0%
c) (7.1±0.2)gm
-
50%
d) (7.2±0.3)gm