Physics Test 114

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Physics Test 114

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Weekly Quiz Competition

Question 1
4 / -1

A ball is projected horizontally from the top of tower at 12 m/s as shown in figure. Wind is blowing as indicated (horizontally), which causes acceleration 6 m/s² horizontally. Displacement of the ball when it strikes the tower, is (g = 10 m/s²)

A
20m

B
60 m

C
80 m

D
40 m

Solution
Question 2
4 / -1

A meter bridge set up as shown to determine end correction at A and B. When a resistance of 15Ω is used in left gap and of 20Ω in right gap, then null point comes at a distance 42cm from A. When these resistances are interchanged, null point comes at a distance 57cm from A. Values of end corrections are :-

A
1 cm, 2 cm

B
2 cm, 3 cm

C
3 cm, 4 cm

D
3 cm, 2 cm

Solution
Question 3
4 / -1

Two light bulbs in the circuit have rating A [24 V, 48W] and B [24V, 36W] as shown.

A
When switch is closed bulb A delivers 24 watt & B delivers 18 watt.

B
When switch is open A delivers 9 watt & B delivers 12 watt approximately.

C
When switch is open A delivers 24 watt & B delivers 18 watt approximately.

D
When switch is open 'A' delivers 6 watt and B delivers 9 watt approximately.
Question 4
4 / -1

Particle is moving on straight line according to given accleration time graph

Choose correct option

A
Velocity of particle is increasing from t = 0 → t = 5

B
Velocity of particle is decreasing from t = 0 → t = 5

C
Velocity of particle may increase or may decrease from t = 0 → t = 5

D
Velocity is constant from t = 0 → t = 5
Question 5
4 / -1

In the circuit shown R₁ = R₂ = 10 Ω and resistance per unit length of wire PQ = 1Ω/cm and length PQ =10 cm. If R₂ is made 20 Ω then to get zero deflection in galvanometer :

(S is midpoint of wire PQ)

A
The jockey at P can be moved towards right 2 cm.

B
The jockey at S can be moved towards left a distance 5/3 cm.

C
The jockey at all positions fixed and R₁ should be made 20 Ω.

D
All are correct

Solution
Question 6
4 / -1

A conical shaped wire of uniform resistivity has ratio of radius of end cross-section 1 : 3. Resistance of wire is 8Ω. Section PQ divides the wire into two equal halves. Choose the correct option(s).

A
Resistance of first half is 6Ω

B
Resistance of second half is 3Ω

C
Potential at PQ is 2.25V

D
option 1 and option 3 are correct

Solution
Question 7
4 / -1

A particle is moving in the x-y plane; the components of its position vector are x = A cos bt,y = A sin bt where A and b are positive constants :

A
The x-component of the instantaneous velocity is |Ab sin bt|

B
The x-component of instantaneous acceleration is |Ab² cos bt|

C
The magnitude of the instantaneous velocity is Ab

D
All are correct

Solution
Question 8
4 / -1

The velocity verses time graph for a particle moving along a straight line is shown below. Choose correct statement(s) :-

A
speed of particle is same at 2sec and 4sec

B
velocity of particle at t = 2sec will be 1m/s

C

D
option 1 and option 3 are correct

Solution

Area from t = 1 to t = 2 is same as 1 to 4 sec.

Area from t = 1 to t = 5 is zero.
Question 9
4 / -1

Directions For Questions

Have you ever seen the trajectory of a projectile. If you watch the trajectories of projectiles thrown at different angles, you would find, there are some projectiles, whose distance from point of projection first increases and then decreases (figure 1), while there may be certain projectiles whose distance from point of projection always increases (figure 2)

If you look closely, you would find at any instant during its flight, a projectile may have a component of velocity along the line (OP) joining projectile and point of projection (figure 3).
As long as this component survives, distance of projectile from point of projection increases.

A projectile is thrown from O on an inclined plane as shown in (figure 4). It hits the plane perpendicularly.

...view full instructions

Maximum distance of projectile from O will be :

A
20 m

B
40 m

C
70 m

D
80 m

Solution
Question 10
4 / -1

Directions For Questions

Have you ever seen the trajectory of a projectile. If you watch the trajectories of projectiles thrown at different angles, you would find, there are some projectiles, whose distance from point of projection first increases and then decreases (figure 1), while there may be certain projectiles whose distance from point of projection always increases (figure 2)

If you look closely, you would find at any instant during its flight, a projectile may have a component of velocity along the line (OP) joining projectile and point of projection (figure 3).

As long as this component survives, distance of projectile from point of projection increases.

A projectile is thrown from O on an inclined plane as shown in (figure 4). It hits the plane perpendicularly.

...view full instructions

If projectile is thrown at time t = 0 then time when projectile will be at a maximum distance from O is :

A
1 s

B
2 s

C
3 s

D
4 s

Solution