Please refer to Physical World MCQ Questions Class 11 Physics below. These MCQ questions for Class 11 Physics with answers have been designed as per the latest NCERT, CBSE books, and syllabus issued for the current academic year. These objective questions for Physical World will help you to prepare for the exams and get more marks.
Physical World MCQ Questions Class 11 Physics
Please see solved MCQ Questions for Physical World in Class 11 Physics. All questions and answers have been prepared by expert faculty of standard 11 based on the latest examination guidelines.
MCQ Questions Class 11 Physics Physical World
Question. If y = (x2 + R2)3/2 where R is a positive constant, then find dy/dx
Answer
B
Question. The charge flowing through a circuit in time interval dt is given by dq = e– t/τ dt, where τ is a constant. How much charge will flow through the circuit between t = 0 to t = τ?
(a) τ/e
(b) τ( 1+1/e)
(c) τ( 1–1/e)
(d) τ (e + 1)
Answer
C
Question. The force F varies with x as F = Kx – x2. The maximum value of F is
(a) K2
(b) K2/2
(c) K2/4
(d) Zero
Answer
C
Question. Which of the following equation is dimensionally incorrect? (U = potential energy, E = energy, P = momentum, m = mass, τ = torque, θ = angular displacement, F = force, K = force constant, x = displacement, v = speed)
Answer
C
Question. Time taken by a vehicle to go from one station to the other is 100 s. It is recorded with a stop watch having the least count 1 s, significant figures in time t = 100 s is
(a) 3
(b) 4
(c) 2
(d) 1
Answer
D
Question. The equation of a wave is y = 2A sin (2π/λ x) cos (2πV/λ t) Which of the following expression is dimensionless?
(a) (2π/λ)
(b) (2πv/λ)
(c) x/vt
(d) xt/λ
Answer
C
Question. If kinetic energy K and momentum p are related as K= a+p2/b , then dimensions of a and b are respectively
(a) [M–1L3T–1], [M2L2T–2]
(b) [M2L2T–2] and [ML0T0]
(c) [M1L2T–2], [ML–3T–1]
(d) [M–2L–2T2], [M1L+3T1]
Answer
B
Question. In a new system of dimensions force (F), distance (r) and gravitational constant (G) are the fundamental dimensions. Find the dimensions of mass
Answer
B
Question. In a new system of units, the unit of mass is 100 kg, unit of length is 1 km and unit of time is 60 seconds. The numarical value of 1 joule in this system will be
(a) 3.6 × 10–5
(b) 3.6 × 10–7
(c) 3.6
(d) 3.6 × 105
Answer
A
Question. The variation of pressure with respect to volume is shown in the graph. Which of the following is correct relation between P and V?
(a) P = 3P0 – (P0/V0)
(b) P = 3P0 +(P0V/V0)
(c) P = 2P0 – (P0/V0)P
(d) P = P0 – (P0/V0)V
Answer
A
Question. The density of a cube is found by measuring its mass and the length of its side. If the maximum errors in the measurement of mass and length are 0.1% and 0.3% respectively, the maximum error in the measurement of density is
(a) 1%
(b) 0.4%
(c) 0.2%
(d) 0.8%
Answer
A
Question. The Bernoulli’s equation may be written as P + 1/2 ρv2 + hρg = K (constant) where P is pressure, ρ is density, v is velocity and h is height. The unit of K/ρv2 is same as that of
(a) Stress
(b) Modulus of rigidity
(c) Density of a body
(d) Relative density
Answer
D
Question. The amplitude of damped oscillations varies with time t as A = A0e–(b/2m)t where b and m are constants. The dimensions of (b/2m) are same as that of
(a) Frequency
(b) Time
(c) Velocity
(d) Displacement
Answer
A
Question. The electric field near a point charge varies with distance x as E = b/x2 , where b is a constant. If percentage error in x is 1%, then percentage error in E will be
(a) 0.5%
(b) – 2%
(c) 2%
(d) 4%
Answer
C
Question. The amplitude (A) of damped oscillations is given as A = α.e– βt, where t is time and α, β are constants. The product αβ may represent
(a) Speed
(b) Angular momentum
(c) Acceleration
(d) Linear momentum
Answer
A
Question. If work done is W = A√t/t2+B then dimensional formula of AB will be
(a) M1L2T–1
(b) M1L1T5/2
(c) M1L2T3/2
(d) M1L2T5/2
Answer
C
Question. If universal gravitational constant G, speed of light c and Planck’s constant h are considered as fundamental quantities, then the dimensional formula of length will be given as [G1/2 c–x h1/2], where x is equal to
(a) 1/2
(b) – 1/2
(c) 3/2
(d)– 3/2
Answer
C
Question. A quantity q depends on three variables x, y and z as q = k (xa yb zc), where k, a, b, c are dimensionless constants. If percentage error in x, y and z are respectively α, β and γ, then percentage error in q will be
(a) α + β + γ
(b) αa + βb + γc
(c) α/a + β/b + γ/c
(d) αa + βb + γc
Answer
B
Question. Given that y=A2sin(t/P – qx)cos2 2πm/Z then which statement is wrong?
(a) Dimension of A is same as that of y
(b) Dimension of t/x is same as that of qp
(c) Dimension of M is same as that of z
(d) Dimension of M/Z is same as that of qx/t
Answer
D
