Physics Test

Question 1
3 / -1

A triangle ABC forces\(\overrightarrow{{P}}, \overrightarrow{{Q}}, \overrightarrow{{R}}\) acting along lA, lB and lC, respectively, in equilibrium, where l is the incentre of ABC. Then,\(\overrightarrow{{P}}, \overrightarrow{{Q}}, \overrightarrow{{R}}\) is

A
\(cos A : cos B : cos C\)

B
\(\cos \frac{A}{2}: \cos \frac{B}{2}: \cos \frac{C}{2}\)

C
\(\sin \frac{A}{2}: \sin \frac{B}{2}: \sin \frac{C}{2}\)

D
\(sin A : sin B : sin C\)

Question 2
3 / -1

The resultant of P and Q is R. If P is reversed, Q remains the same, the new resultant S is at right angle to R. The value of P / Q is

A
1

B
2

C
1/2

D
none of these

Question 3
3 / -1

A heater wire consumes power `P` when connected to a 220V source. If the wire is cut into four equal pieces, which are now connected in parallel, find the power consumed by the combination, if connected to the same power supply.

A
4P

B
P/4

C
16P

D
P/16

Question 4
3 / -1

The apparent depth of water in cylindrical water tank of diameter '2R' cm is reducing at the rate of 'x' cm/min when water is being drained out at a constant rate. The amount of water drained in cc per minute is _____. (n1= refractive index of air and n2= refractive index of water)

A
\(\frac{x \pi R^{2} n_{1}}{n_{2}}\)

B
\(\frac{{x\pi R}^{2} {n}_{2}}{{n}_{1}}\)

C
\(\frac{2 \pi R^{2} n_{1}}{n_{2}}\)

D
\(\pi R^{2} x\)

Question 5
3 / -1

Directions: In the following question, a statement of Assertion is given, followed by a corresponding statement of Reason. Mark the correct answer as:

(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

(b) If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.

(c) If Assertion is true, but Reason is false.

(d) If both Assertion and Reason are false.

Assertion : Neutrons penetrate a matter more readily as compared to protons.

Reason : Neutrons are slightly more massive than protons.

A
A

B
B

C
C

D
D

Question 6
3 / -1

Consider the followingtwo statements A and B and identify the correct answer.

A:Constantan-Copper thermo-couple is generally used to measure temperature upto 1600oC.

B:In an iron-copper thermocouple, current flows from iron to copper through cold junction.

A
Both A and B are true.

B
Both A and B are false.

C
A is true but B is false.

D
A is false but B is true.

Question 7
3 / -1

If power dissipated by 5 Ω resistor is 20 W, then find the power dissipated by 4 Ω resistor.

A
10 W

B
20 W

C
4 W

D
15 W

Question 8
3 / -1

The resultant of forces \(\overrightarrow{{P}}\) and \(\vec{\mathrm{Q}}\) is \(\overrightarrow{{R}}\). If \(\vec{{Q}}\) is doubled,then \(\overrightarrow{{R}}\) is doubled. If the direction of \(\vec{Q}\) is reversed, then \(\vec{R}\) is again doubled, then \(P^{2}: Q^{2}:{R}^{2}\) is

A
\(3: 1: 1\)

B
\(2: 3: 2\)

C
\(1: 2: 3\)

D

\(2: 3: 1\)

Question 9
3 / -1

Two men carry a weight of 240 kg between them by means of two ropes fixed to the weight. One rope is inclined at 60 to the vertical and the other at 30. The tensions in the ropes are

A
\(120 kg, 120 kg\)

B
\(120\sqrt{3} kg, 120 kg\)

C

\(120\sqrt{3} kg, 120\sqrt{3} kg\)

D
None of these

Question 10
3 / -1

During projectile motion, the horizontal velocity

A
first increases then decreases

B
first decreases then increases

C
always increases

D
always constant

Submit Test

Physics Test - ...

Question 1

\(cos A : cos B : cos C\)

\(\cos \frac{A}{2}: \cos \frac{B}{2}: \cos \frac{C}{2}\)

\(\sin \frac{A}{2}: \sin \frac{B}{2}: \sin \frac{C}{2}\)

\(sin A : sin B : sin C\)

Question 2

1

2

1/2

none of these

Question 3

4P

P/4

16P

P/16

Question 4

\(\frac{x \pi R^{2} n_{1}}{n_{2}}\)

\(\frac{{x\pi R}^{2} {n}_{2}}{{n}_{1}}\)

\(\frac{2 \pi R^{2} n_{1}}{n_{2}}\)

\(\pi R^{2} x\)

Question 5

A

B

C

D

Question 6

Both A and B are true.

Both A and B are false.

A is true but B is false.

A is false but B is true.

Question 7

10 W

20 W

4 W

15 W

Question 8

\(3: 1: 1\)

\(2: 3: 2\)

\(1: 2: 3\)

\(2: 3: 1\)

Question 9

\(120 kg, 120 kg\)

\(120\sqrt{3} kg, 120 kg\)

\(120\sqrt{3} kg, 120\sqrt{3} kg\)

None of these

Question 10

first increases then decreases

first decreases then increases

always increases

always constant

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