Physics Test 183

Result

Physics Test 183

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Question 1
4 / -1

A ship A is moving westwards with a speed of 10kmh⁻¹ and a ship B 100 km South of A, is moving northwards with a speed of 10kmh⁻¹. The time after which the distance between them becomes shortest, is

A
5√2h

B
10√2h

C
0 h

D
5 h

Solution

Given situation is shown in the figure

OS = 100 km

OP = Shortest distance

Relative velocity between A and B is
Question 2
4 / -1

A particle is moving such that its position coordinates (x, y) are (2 m, 3 m) at time t = 0, (6 m, 7 m) at time t = 2 s and (13 m, 14 m) at time t = 5 s.

Average velocity vector from t = 0 to t = 5 s is

A

B

C

D

Solution
Question 3
4 / -1

A

B

C

D

Solution
Question 4
4 / -1

A particle has initial velocity The magnitude of velocity after 10 seconds will be

A
9√2 units

B
5√2 units

C
5 units

D
9 units

Solution
Question 5
4 / -1

A missile is fired for maximum range with an initial velocity of 20 m/s. the range of missile is

A
40 m

B
50 m

C
60 m

D
20 m

Solution
Question 6
4 / -1

Choose the wrong statement for zero error and zero correction:

A
If the zero of the vernier scale does not coincide with the zero of the main scale then the instrument is said to be having a zero error.

B
Zero correction has a magnitude equal to zero error but sign is opposite to that of the zero error.

C
Zero error is positive when the zero of vernier scale lies to the left of the zero of the main scale.

D
Zero error is negative when the zero of vernier scale lies to the left of zero of main scale

Solution

if the zero line of the vernier scale is not coinciding with the main scale the zero error exists. Knowing the zero error necessary correction can be made to find correct measurement. Such a correction is called zero correction.

In positive zero error zero of vernier scale lies to right of the zero of the main scale.
Question 7
4 / -1

Which of the following pairs of physical quantities does not have same dimensional formula?

A
Work and torque

B
Angular momentum and Planck's constant

C
Tension and surface tension

D
Impulse and linear momentum.

Solution
Question 8
4 / -1

A particle moves in a straight line with a constant acceleration. It changes its velocity from 10ms⁻¹ to 20ms⁻¹ while passing through a distance 135 m in t second. The value of t is

A
12

B
9

C
10

D
1.8

Solution
Question 9
4 / -1

A car moves from X to Y with a uniform speed vu and returns to Y with a uniform speed v_d. The average speed for this round trip is

A

B

C

D

Solution
Question 10
4 / -1

Two bodies A (of mass 1kg) and B (of mass 3kg) are dropped from heights of 16m and 25m, respectively. The ratio of the time taken by them to reach the ground is

A
4/5

B
5/4

C
12/5

D
5/12

Solution

Time taken by a body fall from a height h to reach the ground is