In which of the following simple machines is the effort applied between the load and the fulcrum?
Cevap
(D)
Sugar tongs
3
The ice and steam points on a mercury in glass thermometer are found to be 90mm apart. What temperature is recorded in degree Celsius when the length of the mercury thread is 33.6mm above the ice point mark?
Cevap
(C)
37.3°C
4
A gas occupies a certain volume at 27°C. At what temperature will its volume be three times the original volume assuming that its pressure remains constant?
Cevap
(D)
627°C
5
When two objects P and Q are supplied with the same quantity of heat,the temperature change in P is observed to be twice that in Q. If the masses of P and Q are the same,calculate the ratio of the specific heat capacities of P and Q
Cevap
(D)
1:2
6
The instrument used in the measurement of atmospheric pressure is?
Cevap
(C)
Barometer
7
A tap supplies water at 30°C while another supplies at 86°C. If a man wishes to bath with water at 44°C, calculate the ratio of mass of hot water to that of cold water required
Cevap
(A)
1:3
8
A steam trap is a component of apparatus used in determining the specific latent heat of vaporization of steam. In the steady state, the steam trap
Cevap
(C)
ensures that only dry steam gets into the calorimeter
9
A hygrometer is an instrument used to measure
Cevap
(D)
Relative humidity
10
The image of an object placed at the center of the curvature of a concave mirror is
Cevap
(E)
at the center of the curvature
11
A simple magnifying glass is used to view an object. At what distance from the lens must the object be placed so that an image 5 times the size of the object is produced 20cm from the lens?
Cevap
(B)
4cm
12
The inability of the eye to focus near objects is known as
Cevap
(A)
Long sight
13
Which of the following are transverse waves? I. Ripples on water II. Sound waves in air III. Light waves from the sun?
Cevap
(B)
I only
14
Which of the following has the shortest wavelength?
Cevap
(B)
Gamma rays
15
The electrical energy supplied by a Leclanche cell is obtained from the
Cevap
(D)
Chemical energy
16
Which of the following is not a part of an A.C generator?
Cevap
(C)
Commutator
17
Which of the following scientists postulated that moving particles exhibit wave properties?
Cevap
(D)
Louis de Broglie
18
A battery of e.m.f 10V an internal resistance 2Ω is connected to a resistance of 6Ω. Calculate the p.d
Cevap
(B)
7.50V
19
A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the two halves of a commutator. Two carbon brushes are made to press lightly against the commutator and when these are connected in a circuit with a battery and a rheostat, the coil rotates. This is a description of
Cevap
(C)
a D.C electric motor
20
A car fuse is marked 15A and operates normally on a 12V battery. Calculate the resistance of the fuse wire
Cevap
(E)
0.8Ω
21
A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field of strength B in the direction of the field. The force on the particle is
Cevap
(A)
qvB
22
A lamp marked 100W, 250V is lit for 10 hours. If it operates normally and 1KWh of electrical energy costs 2k, what is the cost of lighting the lamp?
Cevap
(B)
2k
23
Which of the following is a stringed instrument?
Cevap
(C)
Piano
24
A transformer with 5500 turns in its primary winding is used between a 240V a.c supply and 120V kettle. Calculate the number of turns in the secondary winding
Cevap
(B)
2750
25
Beta particles are
Cevap
(A)
electrons
26
Which of the following substances is not an insulator?
Cevap
(A)
Aluminium
27
When an atom loses or gains a charge, it becomes an
Cevap
(A)
ion
28
In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is the half life of the radioactive material
Cevap
(D)
4.80 days
29
The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?
Cevap
(C)
146
30
The wave function of a metal is 8.0 x \(10^{-19}\)J. Calculate the wavelength of its threshold frequency. (Speed of light in a vacuum = 3 x \(10^8ms^{-1}, Planck's constant = 6.6 \times 10^{-34}\)Js)
Cevap
(C)
2.3 x \(10^{-7}\)m
31
A note of frequency of 2000Hz has a velocity of \(400ms^{-1}\). What is the wavelength of the note?
Cevap
(E)
0.2m
32
A cell of e.m.f. 1.5V and internal resistance of 2.5Ω is connected in series with an ammeter of resistance 0.5W and a resistor of resistance of 7.0Ω. Calculate the current in the circuit.
Cevap
(A)
0.15A
33
A ball is dropped from a height of 45m above the ground. Calculate the velocity of the ball just before it strikes the ground. (Neglect air resistance and take g as \(10ms^{-2}\)
Cevap
(B)
30\(ms^{-1}\)
34
A body accelerates uniformly from rest at \(2ms^{-2}\). Calculate the velocity after traveling 9m
Cevap
(C)
6\(ms^{-1}\)
35
A metal rod of length 40cm at 20°C is heated to a temperature of 45°C. If the new length of the rod is 40.05cm. Calculate its linear expansitivity
Cevap
(E)
5x \(10^{-5}K{-1}\)
36
500g of water is heated so that its temperature rises from 30°C to 72°C in 7 minutes. calculate the supplied per minute. (Specific heat capacity of water is 4200J\(kg^{-1}K^{-1}\)
Cevap
(B)
12600J
37
An electric kettle rated 1500W boils away 0.3kg of a liquid at its boiling point every 300s. Calculate the specific latent heat of the vaporisation of the liquid
Cevap
(A)
1.5 x \(10^6Jkg^-1\)
38
\(500cm^{-3}\) of a gas is collected at 0°C and at a pressure of 72cm of mercury. What is the volume of the the gas at the same temperature and at a pressure of 76cm of the same mercury?
Cevap
(B)
\(\frac{72\times500}{76}cm^3\)
39
The pressure of air in a tire is \(22.5Nm^{-2}\) at 27°C. If the air in the tyre heats up to 47°C, calculate the new pressure of the air, assuming that no air leaks out and that the change in volume of the air can be neglected.
Cevap
(B)
\(24Nm^{-2}\)
40
Calculate the time taken to heat 2kg of water from 50°C to 100°C in an electric kettle taking 5A, from a 210V supply. (Specific heat capacity of water = 4200\(kg^{-1}K{-1}\)
