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11th Standard Physics English Medium Free Online Test 1 Mark Questions 2020 - Part Ten

Published on: 10/11/2020

Download Tamil Nadu 11th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 11th Standard - Physics

chapter: - Model Question paper

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Questions:

Multiple Choice Question

25 x 1 = 25

An air column in a pipe which is closed at one end, will be in resonance with the vibrating body of frequency 83Hz. Then the length of the air column is

(a)

1.5 m

(b)

0.5 m

(c)

1.0 m

(d)

2.0 m

An object of mass 10 kg is hanging on a spring scale which is attached to the roof of a lift. If the lift is in free fall, the reading in the spring scale is

(a)

98 N

(b)

zero

(c)

49 N

(d)

9.8 N

If two objects A and B are moving along a straight line in the same direction with the velocities V_A and V_B respectively, then the relative velocity is ______________

(a)

V_A + V_B

(b)

V_A - V_B

(c)

V_AV_B

(d)

V_A/V_B

The pressure on a square plate is measured by measuring the force on the plate and the length of the sides of the plate by using the formula p =\(F\over l^2\) .If the maximum errors in the measurement of force and length are 4% and 2% respectively, then the maximum error in the measurement of pressure is _________________

(a)

(b)

(c)

(d)

10%

If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is _______________.

(a)

(b)

\({1\over 2}gt^2\)

(c)

ut-\({1\over 2}gt^2\)

(d)

(u+gt)t

An aeroplane moving horizontally with a speed of 180 kmhr^-1drops a food packet while flying at a height of 490 m. while horizontal range of the food packet is _____________.

(a)

500m

(b)

200m

(c)

650m

(d)

925m

The blocks of masses m and M connected by a spring are kept on a smooth horizontal frictionless table. A force f is applied to the mass M. If the acceleration of mass m is 'a' the acceleration of mass M will be ______________.

(a)

\(\frac { am }{ M } \)

(b)

\(\frac { F }{ M } \)

(c)

\(\frac { (F+ma) }{ M } \)

(d)

\(\frac { (F-ma) }{ M } \)

A passenger in the moving train throws a coin. If the coin falls in front of him, train must be moving with ________________.

(a)

uniform speed

(b)

acceleration

(c)

deceleration

(d)

uniform velocity

Slope of displacement-time graph at any instant gives ____________.

(a)

speed

(b)

acceleration

(c)

retardation

(d)

velocity

10.

When a particle is in uniform motion it does not have ______________.

(a)

radial velocity and radial acceleration

(b)

radial velocity and transverse acceleration

(c)

transverse velocity and radial acceleration

(d)

transverse velocity and transverse acceleration

11.

A cyclist bends while taking turn to _______________.

(a)

reduce friction

(b)

generate required centripetal force

(c)

reduce apparent weight

(d)

reduce speed

12.

When two surfaces are coated with a lubricant, then they ______________.

(a)

stick to each other

(b)

slide upon each other

(c)

roll upon each other

(d)

none of these

13.

A body of imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then ______________.

(a)

the body will necessarily change direction

(b)

the body is sure to slow down

(c)

the body will necessarily continue to move in the same direction at the same speed

(d)

none of these

14.

Recoil of a gun is in accordance with _____________.

(a)

conservation of masses

(b)

conservation of momentum

(c)

Newton's third law of motion

(d)

all the above

15.

Newton's second and third laws of motion lead to the conservation of______________.

(a)

linear momentum

(b)

angular momentum

(c)

potential energy

(d)

kinetic energy

16.

Random error can be eliminated by ______________.

(a)

careful observation

(b)

eliminating the cause

(c)

taking mean

(d)

measuring with more than one instrument

17.

If the error in the measurement of radius of a sphere is 3% then the error in the measurement of volume of the sphere will be ________________.

(a)

(b)

(c)

(d)

18.

In Newton's second law \(\vec { F } =m\bar { a } \) (for constant mass m), \(\vec { a } \) is the acceleration of the mass m with respect to ______________.

(a)

any observer

(b)

any inertial observer

(c)

an observer at rest only

(d)

an observer moving with Uniform speed only

19.

First law of Newton deals with the ______________.

(a)

concept of inertia alone

(b)

definition of force alone

(c)

either (a) or (b)

(d)

concept of inertia and definition of force

20.

A book is lying on the table. What is the angle between the action of the book on the table and the reaction of the table on the book?

(a)

0°

(b)

45°

(c)

90°

(d)

180°

21.

A rider on horse fall back when horse starts running all of a sudden because ____________.

(a)

rider is taken back

(b)

rider is suddenly afraid of falling

(c)

inertia of rest keeps the upper part of body at rest whereas lower part of the body moves forward with the horse

(d)

none of these

22.

In non inertial frame, the second law of motion is written as _____________.

(a)

F = ma

(b)

F = ma + Fp

(c)

F = ma - Fp

(d)

F = 2ma

23.

A machine gun has mass 15 kg. It fires 15 g bullet at the rate of 200 bullets per minutes with a speed of 150 m/s. Then the recoil velocity of the gun is ____________.

(a)

20 ms^-1

(b)

15 ms^-1

(c)

150 ms^-1

(d)

0.2 ms^-1

24.

Two masses m₁ = 2 kg and m₂ = 1 kg are connected by a string which passes over a smooth frictionless pulley. The acceleration of the masses when they are released is,

(a)

3.26 ms^-2

(b)

2.26 ms^-2

(c)

1.26 ms^-2

(d)

4.26 ms^-2

25.

If the force is proportional to square of velocity, then the dimension of proportionality constant is

(a)

[MLT⁰]

(b)

[MLT^-1]

(c)

[MLT^-2T]

(d)

[MLT^-1T⁰]

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Answers Key:

Multiple Choice Question

25 x 1 = 25

\(l=\lambda \mathrm{f}=8.3 \mathrm{~Hz} \)
\(v=332 \mathrm{~m} / \mathrm{s} \quad \lambda=4 l \)
\(\lambda=\frac{v}{f}=\frac{332}{83}=4 \mathrm{~m} \)
\(l=\frac{\lambda}{4}=\frac{4 l m}{4}=1.0 \mathrm{~m} \)

(b)
zero

(b)
V_A - V_B

(b)
\({1\over 2}gt^2\)

(a)
500m

(d)
\(\frac { (F-ma) }{ M } \)

(d)
velocity

10.

(b)
radial velocity and transverse acceleration

11.

(b)
generate required centripetal force

12.

(b)
slide upon each other

13.

(b)
the body is sure to slow down

14.

(b)
conservation of momentum

15.

(a)
linear momentum

16.

17.

(d)
9%

18.

19.

(d)
concept of inertia and definition of force

20.

(d)
180°

21.

22.

23.

(d)
0.2 ms^-1

24.

(a)
3.26 ms^-2

25.

F = kv²
Dimensional of k
\(=\frac{\text { Dimension of } \mathrm{F}}{\text { Dimension of }(v)^{2}}\)
\(=\frac{\mathrm{MLT}^{-2}}{\left(\mathrm{LT}^{-1}\right)^{2}}=\frac{\mathrm{MLT}^{-2}}{\mathrm{~L}^{2} \mathrm{~T}^{-2}} \)
\(=\left[\mathrm{ML}^{-1-2} \mathrm{~T}^{-2+2}\right] \)
Dimension of proportionality constant \(=\left[\mathrm{ML}^{-1} \mathrm{~T}^{0}\right]\)