A bar magnet is divided into two pieces, which of the following statement is correct?
Отвечать
(A)
two new magnets are created
3
Consider the wave equation y = 5mm sin [1cm\(^{-1}\)x - 60s\(^{-1}\)t]. The wave number is?
Отвечать
(C)
1.0cm\(^{-1}\)
4
An object 40 cm high is 30cm from the pin hole camera. If the height of the image formed is 20 cm. What is the distance of the image from the pin height?
Отвечать
(A)
15 cm
5
A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when?
Отвечать
(B)
there is no relative motion
6
Tyres are treaded to?
Отвечать
(B)
increase friction
7
A car starts from rest and covers a distance of 40 m in 10 s. Calculate the magnitude of its acceleration
Отвечать
(C)
0.80 ms\(^{-2}\)
8
The relationship between the coefficient of linear expansion \(\alpha\) and volumetric expansion (\(\gamma\)) is-----------------
Отвечать
(C)
3\(\alpha\)
9
Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?
Отвечать
(C)
local action
10
A cell whose internal resistance is 0.55\(\Omega\) delivers a current of 4 A to an external resistor. The lost voltage of the cell is?
Отвечать
(B)
2.20 V
11
Which of the following liquid is a poor conductor of electricity?
Отвечать
(A)
Distilled water
12
An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. The half-life is?
Отвечать
(B)
2 days
13
The secondary pigments consist of?
Отвечать
(C)
magenta, yellow, and cyan
14
A person standing waist-deep in a swimming pool appears to have short legs because of light?
Отвечать
(B)
refraction
15
A tuning fork having a frequency of 312 Hz emits a wave which has a wavelength of 1.10 m. Calculate the velocity of sound
Отвечать
(C)
343.2 ms\(^{-1}\)
16
When the plate area of a capacitor increases?
Отвечать
(D)
the capacitance increases
17
A magnet relay is a device used for?
Отвечать
(B)
controlling another circuit carrying larger current
18
According to kinetic molecular model in gases,
Отвечать
(C)
the molecules are very far apart and occupy all the spaces made available to them
19
A current of 0.5 A flows through a resistor when connected to a 40 V battery. How much energy is dispatched in 2 minutes?
Отвечать
(A)
2400 J
20
For a pear-shaped conductor shown above, the concentration of charge on the outside is highest at?
Отвечать
(A)
X
21
The vapour pressure?
Отвечать
(A)
increases non-linearly with measuring temperature
22
The potential energy in an elastic string of force constant k, which has an extension X is?
Отвечать
(C)
½KX\(^{2}\)
23
A reservoir is filled with liquid of density 2000 kgm\(^{-1}\). Calculate the depth at which the pressure in the liquid will be equal to 9100 Nm\(^{-2}\) (g = 10 ms\(^{-2}\))
Отвечать
(D)
0.455 m
24
Water is not a good thermometric liquid because it?
Отвечать
(D)
wets glass
25
Which of these is a second-class lever?
Отвечать
(D)
wheelbarrow
26
In the formation of sea breeze, wind blows from?
Отвечать
(D)
sea to land
27
Which component of fiber-optic connector has a provision of entry for the fibre along with the fixation to connector housing?
Отвечать
(A)
coupling device
28
In order to view the sun, the most suitable instrument to use is?
Отвечать
(A)
helioscope
29
The eclipse of the moon occurs when?
Отвечать
(C)
the earth comes exactly between the moon and the sun
30
The gravitational pull on the moon is \(\frac{1}{6}\) that of the earth. If a body weighs 6.0 N on the moon, what will be the weight on the earth?
Отвечать
(D)
36.0 N
31
The amount of energy required to change a kilogram of ice block into water without a change in temperature is?
Отвечать
(A)
specific latent heat of fusion of ice
32
Which expression gives magnetic flux?
Отвечать
(C)
BA cos \(\theta\)
33
The graph of pressure (P) against the reciprocal of the volume (I/V) in Boyles's law is a?
Отвечать
(D)
straight line
34
What quantity of heat is required to convert 20 g of ice at 0 ºC to water at the same temperature? (Specific latent heat of ice = 336 Jg\(^{-1}\))
Отвечать
(C)
6.72 x 10\(^{3}\)J
35
A train of mass 1600 kg attains a speed of 25 ms\(^{-1}\) in 20 seconds. The power developed in the engine is?
