Science Quiz (Physics)

Sample Paper

Science Quiz (Physics)

Q 1. Units of magnetic flux are :

(a) weber/metre (b) newton metre/ampere

Q 2. Magnetic intensity is measured in :

(a) A m ¯1 (b) tesla

Q 3. Earth has a mass of 5.98 x 1024 kg. The average mass of atoms that make up the earth is 40 u. Number of atoms in earth is :

(a) 9.0 x 1049 (b) 9.0 x 1046

Q 4. Which of the following is a dimensional constant ?

(a) refractive index (b) dielectric constant

Q 5. If units of two systems of measurement are in the ratio 2 : 3, then the ratio of units of angular momentum in those two system is :

(a) 2 : 3 (b) 9 : 4

Q 6. If speed of light (c), acceleration due to gravity (g) and pressure (p) are taken as fundamental units, the dimensions of gravitational constant (G) are :

(a) c g p¯3 (b) c2 g3 p¯2

Q 7. The length of a cylinder is measures with a metre rod having least count 0.1 cm. Its diameter is measured with vernier callipers having least count 0.01 cm. Given the length is 5·0 cm and radius is 2.00 cm. The percentage error in the calculated value of volume will be :

(a) 2% (b) 1%

Q 8. How many seconds are there in a light fermi ?

(a) 10¯15 (b) 3.0 x 108

Q 9. The unit of thermal conductance is ?

(a) WK¯1 (b) JK¯1

Q 10. A student measured the length of a pendulum as 1.35 m and time for 30 vibrations as 2 min. 20 sec. using a wrist watch. Find the percentage error in g.

(a) 1.72% (b) 2.16 %

Q 11. A particle has two equal accelerations in two given directions. If one of the accelerations is halved, then the angle which the resultant makes with the other is also halved. The angle between the accelerations is :

(a) 1200 (b) 900

Q 12. Out of the following pairs of forces, the resultant of which can not be 4 N ?

(a) 2N and 2N (b) 2N and 4N

Q 13. The resultant of which of the following sets of forces can not be zero :

(a) 10, 20 and 40 (b) 10, 10 and 20

Q 14. The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 900 with the force of the smaller magnitude, then their magnitudes are :

(a) 3, 15 (b) 4, 14

Q 15. The square of resultant of two equal forces is three times their product. Angle between the forces is :

(a) π (b) π / 2

Q 16. The line of action of the resultant of two like parallel forces shifts by one-fourth of the distance between the forces when the two forces are interchanged. The ratio of the two forces is:

(a) 1 : 2 (b) 2 : 3

Q 17. The sum of two forces acting at a point is 16 N. If the resultant force is 8 N and its direction is perpendicular to minimum force then the forces are :

(a) 6 N and 10 N (b) 8 N and 8 N

Q 18. Two boats are moving in same direction in a river. What is the best condition so that they move parallel in the same direction?

(a) Both move away from each other

(b) They are slightly bent to each other

(d) It is not possible

Q 19. An aeroplane moves 400 m towards north, 300 m towards west and then 1200 m vertically upwards. Then its displacement from the initial position is :

(a) 1300 m (b) 1400 m

Q 20. A bus travelling the first one third distance at a speed of 10km/h, the next one fourth at 20 km/h and the remaining at 40 km/h. The average speed of the bus is nearly

(a) 9 km/h (b) 16 km/h

Q 21. A stone is dropped from the top of a tower and travels 24.5 m in last second of its journey. The height of the tower is :

(a) 44.1 m (b) 49 m

Q 22. A body freely falling from rest has a velocity ν after its falls through a height h. The distance it has to fall down further for its velocity to become double is :

(a) h (b) 2 h

Q 23. Drops of water fall from the roof of a building 9 m high at regular intervals of time, the first drop reaching the ground at the same instant fourth drop starts its fall. What are the distances of the second and third drops from the roof ?

(a) 6m and 2m (b) 6m and 3m

Q 24 A particle accelerates from rest at a constant rate for some time and attains a velocity of 8 m/s. Afterwards it decelerates with the constant rate and comes to rest. If the total time taken is 4 second, the distance travelled is :

(a) 4 m (b) 16 m

Q 25 A car is moving on a road and rain falling vertically. Select the correct answer:

(a) The rain will strike the hind screen only

(b) The rain will strike the front screen only

(d) The rain will not strike any of the screens

Q 26. A sprinter accelerates to his maximum speed in 4s. If such a sprinter finishes a 140 m race in 9s, what is the runner’s acceleration during the first four seconds? Assume acceleration to be constant

(a) 3.5 ms ¯2 (b) 4.2 ms ¯2

Q 27 A steamer takes 12 days to reach from port x to port y. Every day only one steamer sets out from both the ports. How many steamers does each steamer meet in the open sea?

(a) 23 (b) 25

Q 28 In a race for 100 m dash, the first and the second runners have a gap of one metre at the mid way stage. Assuming the first runner goes steady, by what percentage should the second runner increases his speed just to win the race.

(a) 2% (b) 4%

Q 29 A motor boat covers a given distance in 6 hours moving down stream of a river. It covers the same distance in 10 hours moving upstream. The time (in hours) it takes to cover the same distance in still water is :

(a) 6 (b) 7.5

Q 30 A point initially at rest moves along x-axis. Its acceleration varies with time as a = (6 t + 5) in ms¯2. If it starts from origin, the distance covered in 1 second is :

(a) 3 m (b) 3.5 m

Q 31 A ball rolls off the top of stairway with a horizontal velocity of magnitude 1 · 8 m/s. The steps are 0 · 20 m high and 0 · 20 m wide. Which step will the ball hit first?

(a) first (b) second

Q 32 When air resistance is taken into account while dealing with the motion of the projectile which of the following properties of the projectile, shows an increase,

(a) range (b) maximum height

(d) the angle at which the projectile strikes the ground

Q 33 The range of a projectile fired at an angle of 150 is 50 m. If it is fired with the same speed at an angle of 450, its range will be :

(a) 25 m (b) 50 m

Q 34 In case of a projectile, what is the angle between the instantaneous velocity and acceleration at the highest point?

(a) 450 (b) 1800

Q 35 A man can throw a stone to a max distance of 80 metres. The maximum height to which it will rise in metres is :

(a) 10 m (b) 20 m

Q 36 The equation of projectile is y = px - qx2. Its horizontal range is :

(a) pq (b) p/q

Q 37 A grass hopper finds that he can jump a maximum horizontal distance of 1 m. With what speed can he travel along the path if he spends a negligible time on the ground :

(a) 9.8 m/s (b) 4.42 m/s

Q 38 The speed of projection of a projectile is increased by 10%, without changing the angle of projection. The percentage increase in the range will be :

(a) 10% (b) 20%

Q 39 Two paper screens A and B are separated by a distance of 200 m. A bullet pierces A and then B. The hole in B is 40 cm below the hole in A. If the bullet is travelling horizontally at the time of hitting A, then the velocity of the bullet at A is :

(a) 200 m/s (b) 400 m/s

Q 40 With what minimum speed a particle be projected from the origin so that it is ablve to pass through a given point (30m, 40 m) :

(a) 30 ms ¯ 1 (b) 40 ms ¯ 1

Q 41 A car accelerates on a horizontal road due to the force exerted by :

(a) road on the car (b) engine of car

Q 42 A ball of mass 0 · 4 kg thrown up in air with velocity of 30 ms ¯ 1 reaches the highest point in 2 · 5 sec. The air resistance encountered by the ball during upward motion is :

(a) 0.88 N (b) 8800 N

Q 43 A fat hose pipe is held horizontal by a fireman. It delivers water through a nozzle at one litre/sec. If by increasing the pressure, the water is delivered of 2 litre/sec, the fireman now has to :

(a) Push forward twice as hard

(b) Push forward four times as hard

(d) Pull backward four times as hard

Q 44 A dish of mass 10 g is kept horizontally in air by firing bullets of mass 5 gm each at the rate of 10 per sec. If the bullets rebound with the same speed, what is the velocity with which the bullets are fired?

(a) 49 cm/sec (b) 98 cm/sec

Q 45 A player caught a cricket ball of mass 150 gram, which was moving with a velocity of 20 m/s. If the catching process is completed in 0·1 second, the blow exerted by the ball on the hands of the player is :

(a) 100 N (b) 30 N

Q 46 A cricket ball of mass 250 g collides with a bat with velocity 10 m/s and returns with same velocity within 0·01 sec. The force acting on bat is :

(a) 25 N (b) 50 N

Q 47 A machine gun has a mass 5 kg. It fires 50 gram bullets at the rate of 30 bullets per minute at a speed of 400 ms ¯ 1. What force is required to keep the gun in position?

(a) 10 N (b) 5 N

Q 48 A uniform chain of length 8 m and mass 4 kg is hanging vertically from a pulley. The work done is winding the chain on to the pulley is (g = 10 m/s2) :

(a) 16 J (b) 160 J

Q 49 A 60 kg woman pushes a 20 kg suitcase on wheels, a distance of 10 m by exerting a constant force of 2 N on it in the direction of motion, starting from rest. The work done by the woman is :

(a) 20 joule (b) 2 joule

Q 50 A car covers a distance of 10 km along an inclined plane under the action of a horizontal force of 5 N. The work done on car is 25 kJ. The inclination of the plane to horizontal is :

(a) 0o (b) 30o

Q 51 Work done in holding a 15 kg suitcase while waiting for a bus for 15 minutes is :

(a) 1 kg.m (b) 225 J

Q 52 A body is projected vertically up. At certain height h above the ground, its PE and KE are in the ratio 1 : 4. At what height above the ground PE and KE will be in the ratio 4 : 1 ?

(a) 4 h (b) h/4

Q 53 Once a choice is made regarding zero potential energy references state, the changes in potential energy :

(a) are same (b) are different

(d) become indeterminate

Q 54 A ball of mass 0·01 kg moves with a velocity of 100 m/sec. How much uniform force will stop it in 10 seconds ?

(a) 0·2 newton (b) 1·0 newton

Q 55 A rail way truck of mass 2 x 104 kg travelling at 0.5 m/s collides with another truck of half its mass moving in opposite direction with velocity 0.4 m/s. If two trucks couple, their common velocity would be:

(a) 0·2 m/s (b) 0·3 m/s

Q 56 When a body is projected vertically up from the ground, its PE and KE at a point P are in the ratio 2 : 3. If same body is projected with double the previous velocity, then at the same point P ratio of its P.E. and KE would be:

(a) 9 : 1 (b) 1 : 9

Q 57 In an ice rink, a skator moving at 3 m/s encounters a rough patch that reduces her speed by 45%. Find the length of the rough patch if frictional force is 25 % of her weight :

(a) 1·28 m (b) 1·46 m

Q 58 An aeroplane flies in a horizontal circle of radius 3·06 km at a speed of 150 m/s. The direction of the resultant force on air craft is :

(a) 37o with the vertical (b) 53o with the vertical

Q 59 A coin is placed on a gramophone record rotating at a speed of 45 rpm. It flies away when the rotational speed is 50 rpm. It two such coins are placed one over the other on the same record, both of them will fly away when rotational speed is :

(a) 100 rpm (b) 25 rpm

Q 60 The ratio of the angular speed of minutes hand and hour hand of a watch is :

(a) 6 : 1 (b) 12 : 1

Q 61 What is the ratio of the angular speeds of the minute hand and second hand of a clock?

(a) 1 : 12 (b) 12 : 1