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Day 3 7am answer jamb march 12
By: Eda Date: March 12, 2018, 2:23 am
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PHYSICS 7AM
1 :- in the production of a pure spectrum of white light, the
purpose of the collimator is to
CORRECT ANSWER =
produce a parallel beam
2 :- at what temperature will the contigrade scale triple the
fahrenteit scale?
CORRECT ANSWER =
– 7.27 0F
3 :- a device that is commonly used as a switch in electronics
is
CORRECT ANSWER =
transistor
4 :- a liquid with its angle of contacy being acute angle has
greater
CORRECT ANSWER =
cohesive force
5 :- the type of motion desiplayed by a simple pendulum is
CORRECT ANSWER =
oscillatory
6 :- which of the liquid above are volatile?
CORRECT ANSWER =
I, II ,III and IV
7 :- dissolved impurities in water will
CORRECT ANSWER =
increase it boiling point
8 :- calculate the magnitude of the forces on a 0.0m wire
carrying 20A current in 0.6T magnetic field at 90 0 to the
straight wire
CORRECT ANSWER =
0.6N
9 :- the saturated vapour pressure of liquid depends only on
CORRECT ANSWER =
temperature
10 :- if the mass of metal is 0.012kg and its temperature is
raised from 15 0C to 20 0C by 50J of heat, calculate its
specific heat capacity
CORRECT ANSWER =
833.3 J kg -1 K-1
11 :- a stone hauled into water from a ship sinks while the ship
remains afloadt due to
CORRECT ANSWER =
buoyancy
12 :- from the diagram above , what is the velocity ratio of the
sytem of pulleys?
CORRECT ANSWER =
4
13 :- the above nuclear reaction is
CORRECT ANSWER =
Nuclear fission
14 :- thye moment of a force about a point is given as
CORRECT ANSWER =
the product of the force
15 :- from the diagram above, what is the effective resistance?
CORRECT ANSWER =
(R1 R2/R1+R2 + R3)
16 :- Alkaline accumulators may be preferred over lead – acid
ones because
CORRECT ANSWER =
they have longer life
17 :- a glass block of thickness 4.5cm is placed on a black dot
on a pieces of paper. Calculate the displacement of the dot when
it is viewed vertically downwards.
CORRECT ANSWER =
1.5cm
18 :- waves used by ships in echo sounding have
CORRECT ANSWER =
very high frequency
19 :- the visocity of a liquid is
CORRECT ANSWER =
directly proportional
20 :- when there is an increase in pressure at any point in a
confined fluid, there is an increased at every other point in
the container. What principle is this based on?
CORRECT ANSWER =
pascal
21 :- to produce final images that are not inverted, the
Galilean telescope is constructed using
CORRECT ANSWER =
two converging lens
22 :- convex mirrors are used as rear view mirrors in the
vehicles because they produce images that are
CORRECT ANSWER =
erect and dimished
23 :- calculate the workdone per minute in lifting 1000kg of
water through a height of 3m in 5minutes.
CORRECT ANSWER =
100W
24 :- which of the above are the industrial applications of
electrolysis?
CORRECT ANSWER =
I and III
25 :- the unit for domestic electric power consumption is
CORRECT ANSWER =
Kwh
26 :- from the diagram above, calculate the strain on the string
(g = 10ms-2; elastic constant = 500Nm -1)
CORRECT ANSWER =
0.08
27 :- the wavelenght of a component of the electromagnetic
spectrum is 4.8 x 10-6m. Find its frequency ( c = 3.0 x 10
8ms-1)
CORRECT ANSWER =
6.25 x 1013 Hz
28 :- the pressure of fixed mass of a gas is inversely
proportioanl to its volume, provide that the temperature is kept
constant. This law is known as
CORRECT ANSWER =
Boyle’s Law
29 :- which of the instrument above gives the most accurate
measurement?
CORRECT ANSWER =
II
30 :- the dialectric in a capacitor is usually
CORRECT ANSWER =
an insulator
31 :- if a container containing a certain liquid was heated and
there was expansion of both liquid and the container, the liquid
expriences
CORRECT ANSWER =
apparent expansivity
32 :- the wave given in the diagram above is
CORRECT ANSWER =
destructive interference
33 :- lighting conductions fixed in buildings conduct charges
from the
CORRECT ANSWER =
building into the ground
34 :- calculate the current in a 0.12H coil connected to 110V,
20Hz source
CORRECT ANSWER =
7.290A
34 :- calculate the current in a 0.12H coil connected to 110V,
20Hz source
CORRECT ANSWER =
7.290A
36 :- a transformer which provide higher e.m.f at secondary coil
than at the primary coil is called
CORRECT ANSWER =
step – up transformation
37 :- all objects dropped from the same height, in the same
medium, irrespective of their masses have the same
CORRECT ANSWER =
acceleration due to gravity
38 :- the following statements are corretc about magnets and
magnetic field EXCEPT
CORRECT ANSWER =
compass needle
39 :- a pipe of length 1.20m open at both ends resonance with a
second overtone when a tuirning fork of frequency 442Hz is
sounded at its end. Calculate the speed of sound in air
CORRECT ANSWER =
354m/s
40 :- energy level of the atom was proposed by
CORRECT ANSWER =
Bohr
WISH YOU GOODLUCK!
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