Worksheets10 - Science - Physics
Total questions: 48
Worksheet time: 24mins
Name
Class
Date
1.
Inertia of a body depends on
a)
Weight of the object
b)
Acceleration due to gravity of the planet
c)
Mass of the object
d)
Both a & b
2.
Impulse is equal to
a)
rate of change of momentum
b)
rate of force and time
c)
Change of momentum
d)
rate of change of mass
3.
Newton’s III law is applicable
a)
for a body at rest
b)
for a body in motion
c)
both a & b
d)
only for bodies with equal masses
4.
Plotting a graph for momentum on the Y-axis and Time on X-axis. Slope of momentum – time graph gives
a)
Impulsive force
b)
Acceleration
c)
Force
d)
Rate of force
5.
In which of the following sport the turning of effect of force used
a)
Swimming
b)
Tennis
c)
Cycing
d)
Hockey
6.
The unit of ‘g’ is ms-2. It can be also expressed as
a)
cm s-1
b)
N kg-1
c)
N m2 kg-1
d)
cm-2 s-2
7.
One kilogram force is equals to
a)
9.8 dyne
b)
9.8 x 104 N
c)
98 x 104 dyne
d)
980 dyne
8.
The mass of a body is measured on planet Earth as M Kg. When it is taken to a planet of radius half that of the earth then its value will be ____kg
a)
4 M
b)
2M
c)
M/4
d)
M
9.
If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body means on the earth will
a)
Decrease by 50%
b)
Increase by 50%
c)
Decrease by 25%
d)
Increase by 300%
10.
To project the rockets which of the following principle is required ?
a)
Newton’s third law of motion
b)
Newton’s law of gravitation
c)
Law of conservation of momentum
d)
both a & c
11.
The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in
a)
A
b)
B
c)
C
d)
D
12.
Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens.
a)
F
b)
2F
c)
Infinity
d)
Between f and 2f
13.
A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on , the lens will produce
a)
a convergent beam of light
b)
a divergent beam of light
c)
a parallel beam of light
d)
a coloured beam of light
14.
Magnification of convex lens is
a)
Positive
b)
Negative
c)
Either positive or negative
d)
Zero
15.
A convex lens forms a real, diminished point sized image at focus. Then the position of the object is at
a)
focus
b)
infinity
c)
at 2f
d)
between f and 2f
16.
Power of lens is -4D , then its focal length is
a)
4m
b)
-40m
c)
-0.25m
d)
-2.5m
17.
In a myopic eye , the image of the object is formed
a)
behind the retina
b)
on the retina
c)
infront of the retina
d)
in the blind spot
18.
The eye defect ‘presbyopia’ can be corrected by
a)
convex lens
b)
concave lens
c)
convex mirror
d)
bi focal lenses
19.
Which of the following lens would you prefer to use while reading small letters found in a dictionary
a)
A convex lens of focal length 5 cm
b)
A concave lens of focal length 5 cm
c)
A convex lens of focal length 10 cm
d)
A concave lens of focal length 10 cm
20.
If VB, VG, VR be the velocity of blue, green ,red light respectively in a glass prism, then which of the following statement gives the correct relation
a)
VB = VG = VR
b)
VB > VG > VR
c)
VB < VG < VR
d)
VB < VG > VR
21.
The value of universal gas constant
a)
3.81 Jmol–1 K–1
b)
8.03 Jmol–1 K–1
c)
1.38 Jmol–1 K–1
d)
8.31 Jmol–1 K–1
22.
If a substance is heated or cooled, the change in mass of that substance is
a)
positive
b)
negative
c)
zero
d)
none of the above
23.
If a substance is heated or cooled, the linear expansion occurs along the axis of
a)
X or –X
b)
Y or –Y
c)
both (a) and (b)
d)
(a) or (b)
24.
Temperature is the average ___________ of the molecules of a substance
a)
difference in K.E and P.E
b)
sum of P.E and K.E
c)
difference in T.E and P.E
d)
difference in K.E and T.E
25.
In the Given diagram, the possible direction
of heat energy transformation is
a)
A <- B , A <- C , B <- C
b)
A-> B , A-> C , B-> C
c)
A-> B , A <- C , B-> C
d)
A <- B , A-> C , B <- C
26.
Which of the following is correct?
a)
Rate of change of charge is electrical power.
b)
Rate of change of charge is current.
c)
Rate of change of energy is current
d)
Rate of change of current is charge.
27.
SI unit of resistance is
a)
mho
b)
joule
c)
ohm
d)
ohm meter
28.
In a simple circuit, why does the bulb glow when you close the switch?
a)
The switch produces electricity.
b)
Closing the switch completes the circuit.
c)
Closing the switch breaks the circuit.
d)
The bulb is getting charged.
29.
Kilowatt hour is the unit of
a)
Resistivity
b)
Conductivity
c)
Electrical energy
d)
Electrical power
30.
When a sound wave travels through air, the air particles
a)
Vibrate along the direction of the wave motion
b)
vibrate but not in any fixed direction
c)
Vibrate perpendicular to the direction of the wave motion
d)
do not vibrate
31.
Velocity of sound in a gaseous medium is 330 ms–1. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is
a)
330 ms–1
b)
660 ms1
c)
156 ms–1
d)
990 ms–1
32.
The frequency, which is audible to the human ear is
a)
50 kHz
b)
20 kHz
c)
15000 kHz
d)
10000 kHz
33.
The velocity of sound in air at a particular temperature is 330 ms–1. What will be its value when temperature is doubled and the pressure is halved?
a)
330 ms–1
b)
165 ms–1
c)
330 × √2 ms–1
d)
320/√ 2 ms–1
34.
If a sound wave travels with a frequency of 1.25 × 104 Hz at 344 ms–1, the wavelength will be
a)
27.52 m
b)
275.2 m
c)
0.02752 m
d)
2.752 m
35.
The sound waves are reflected from an obstacle into the same medium from which they were incident. Which of the following changes?
a)
Speed
b)
frequency
c)
wavelength
d)
none of these
36.
Velocity of sound in the atmosphere of a planet is 500 ms–1. The minimum distance between the sources of sound and the obstacle to hear the echo, should be
a)
17 m
b)
20 m
c)
25 m
d)
50 m
37.
Man-made radioactivity is also known as _____________
a)
Induced radioactivity
b)
Spontaneous radioactivity
c)
Artificial radioactivity
d)
a & c
38.
Unit of radioactivity is _____________
a)
roentgen
b)
curie
c)
becquerel
d)
all the above
39.
Artificial radioactivity was discovered by ____________
a)
Bequerel
b)
Irene Curie
c)
Roentgen
d)
Neils Bohr
40.
In which of the following, no change in mass number of the daughter nuclei takes place
i) α decay
ii) β decay
iii) γ decay
iv) neutron decay
a)
(i) is correct
b)
ii) and (iii) are correct
c)
(i) & ( iv) are correct
d)
(ii) & (iv) are correct
41.
____________ isotope is used for the treatment of cancer
a)
Radio Iodine
b)
Radio Cobalt
c)
Radio Carbon
d)
Radio Nickel
42.
Gamma radiations are dangerous because
a)
it affects eyes & bones
b)
it affects tissues
c)
it produces genetic disorder
d)
it produces enormous amount of heat
43.
_____________ aprons are used to protect us from gamma radiations
a)
Lead oxide
b)
Iron
c)
Lead
d)
Aluminium
44.
Which of the following statements is/are correct?
i. α particles are photons
ii. Penetrating power of γ radiation is very low
iii. Ionization power is maximum for α rays
iv. Penetrating power of γ radiation is very high
a)
(i) & (ii) are correct
b)
(ii) & (iii) are correct
c)
(iv) only correct
d)
(iii) & (iv) are correct
45.
Proton - Proton chain reaction is an example of __________________
a)
Nuclear fission
b)
α - decay
c)
Nuclear fusion
d)
β - decay
46.
Proton - Proton chain reaction is an example of __________________
a)
8, 6
b)
8, 4
c)
4, 8
d)
cannot be determined with the given data
47.
Kamini reactor is located at __________
a)
Kalpakkam
b)
Koodankulam
c)
Mumbai
d)
Rajasthan
48.
Which of the following is/are correct?
i. Chain reaction takes place in a nuclear reactor and an atomic bomb.
ii. The chain reaction in a nuclear reactor is controlled
iii. The chain reaction in a nuclear reactor is not controlled
iv. No chain reaction takes place in an atom bomb
a)
(i) only correct
b)
(i) & (ii) are correct
c)
(iv) only correct
d)
(iii) & (iv) are correct
100 %
