# KCET 2020 Physics Questions with Answers Key Solutions

## 5 km

## 20 km

## 10 km

## 15 km

## 25 rad

## 100 rad

## 25 $\pi$ rad

## 50 $\pi$ rad about a vertical axis

## 0.917

## 1

## 0.458

## 0

## plate will cool the fastest and cube the slowest

## sphere will cool the fastest and cube the slowest

## plate will cool the fastest and sphere the slowest

## cube will cool the fastest and plate the slowest

## Decreases

## Increases

## Remains constant

## At first increases and then decreases

## 1

## $\frac {2}{3}$

## $\frac {2}{5}$

## $\frac {5}{7}$

## $50 \,Nm^{-1}$

## $0$

## $105 \,Nm+- 1$

## $\infty$

## $0$

## $\frac {q}{24\epsilon_o}$

## $\frac {q}{6\epsilon_o}$

## $\frac {q}{72\epsilon_o}$

## $4 \times 10^{-4} Vm^{-1}$

## $8 \times 10^{-4} Vm^{-1}$

## $16 \times 10^{-4} Vm^{-1}$

## $1 \times 10^{-4} Vm^{-1}$

## $1.12 \times 10^8 \,NC^{-1}$

## $4.5 \times 10^8 \,NC^{-1}$

## $2.25 \times 10^8 \,NC^{-1}$

## $9 \times 10^8 \,NC^{-1}$

## $\sqrt{\frac{PE}{I}}$

## $2\pi\sqrt{\frac{I}{PE}}$

## $ \frac {1}{2\pi} \sqrt{\frac{PE}{I}}$

## $ \pi \sqrt{\frac{I}{PE}}$

## $2 \mu F$

## $3 \mu F$

## $4 \mu F$

## $6 \mu F$

## $V_A = V_B = V_C$

## $V_A = V_B > V_C$

## $V_A = V_B < V_C$

## $V_A > V_B = V_C$

## Its radius increases

## Its radius decreases

## The radius remains the same

## Its radius may increase or decrease

## $1.5 \times 10^5 \,ms^{-1}$

## $2.5 \times 10^6 \,ms^{-1}$

## $2.1 \times 10^7 \,ms^{-1}$

## $2.5 \times 10^8 \,ms^{-1}$

## maximum when the battery is connected across $1 \,cm \times \frac {1}{2}$ cm faces

## maximum when the battery is connected across $10 \,cm\, \times \frac {1}{2} cm $ faces

## maximum when the battery is connected across $10 \,cm \times$ 1 cm faces

## same irrespective of the three faces

## 12V

## 8.4V

## 8.4V

## 9.3V

## Red, Grey, Brown, Silver

## Red, Green, Brown, Silver

## Red, Grey, Silver, Silver

## Red, Green, Silver

## $\frac {5} {6} \Omega$

## $\frac {6} {5} \Omega$

## $\frac {5} {12} \Omega$

## $\frac {12} {5} \Omega$

## More if experiment is performed at higher temperature

## More if a wire of steel of same dimension is used

## Less if the area of the wire is increased

## Less if the length of the wire is increased

## $\frac {3}{4} \frac {\mu_oI}{r}+\frac {\mu_oI}{4\pi r}$

## $\frac {3}{10} \frac {\mu_oI}{r} - \frac {\mu_oI}{4\pi r}$

## $\frac {3}{8} \frac {\mu_oI}{r} + \frac {\mu_oI}{4\pi r}$

## $\frac {3}{8} \frac {\mu_oI}{r} - \frac {\mu_oI}{4\pi r}$

## $\frac{\mu_{0}i}{4\pi} \frac{\overrightarrow{d1} \times \overrightarrow{r}}{r^{3}}$

## $\frac{\mu_{0}i}{4\pi} \frac{\overrightarrow{r} \times \overrightarrow{d1}}{r^{3}}$

## $\frac{\mu_{0}i}{4\pi} \frac{\overrightarrow{d1} \times \overrightarrow{r}}{r^{2}}$

## $\frac{\mu_{0}i}{4\pi} \frac{\overrightarrow{r} \times \overrightarrow{d1}}{r^{2}}$

## $\alpha$-particle

## Proton

## Deuteron

## Same for all

## $\frac{32}{3} Am^{-1}$

## $\frac{2}{3} Am^{-1}$

## $6 Am^{-1}$

## $2.4 Am^{-1}$

## 2x

## 4x

## $\frac{x}{4}$

## $\frac{x}{8}$

## Magnetic moment of each molecule is zero

## The individual molecules have non-zero magnetic moment which are all perfectly aligned

## Domains are partially aligned

## Domains are all perfectly aligned

## 75 mA

## 133 mA

## 0.75 A

## 1.33 A

## 0.6 V

## 1.2 V

## 30 V

## 0.3 V

## 100 V

## 200 V

## 70.7 V

## 141 V

## $2\Omega$

## $\sqrt{2}\Omega$

## $0.5\Omega$

## $\frac{1}{\sqrt{2}}\Omega$

## $2\times10^{-5} kg ms^{-1}$

## $1\times10^{-5} kg ms^{-1}$

## $5\times10^{-5} kg ms^{-1}$

## $1.2\times10^{-5} kg ms^{-1}$

## Moves away from the lens with an uniform speed 5 m/s

## Moves away from the lens with an uniform acceleration

## Moves away from the lens with a non- uniform acceleration

## Moves towards the lens with a non-uniform acceleration

## $180^\circ -3 A$

## $180^\circ +2 A$

## $90^\circ - A$

## $180^\circ -2 A$

## $128 Wm^{-2}$

## 0

## $16 Wm^{-2}$

## $64 Wm^{-2}$

## 10.8 km

## 5.4 km

## 188 m

## 376 m

## 2 mm

## 0.5 mm

## 0.125 mm

## 0.25 mm

## $0.3 \overset{\circ}{\ce{A}}$

## $3.3 \overset{\circ}{\ce{A}}$

## $6.26 \overset{\circ}{\ce{A}}$

## $10 \overset{\circ}{\ce{A}}$

## $\gamma_1 = \gamma_2$ and $I_1 \ne I_2$

## $\gamma_1 = \gamma_3$ and $I_1 \ne I_3$

## $\gamma_1 = \gamma_2$ and $I_1 = I_2$

## $\gamma_2 = \gamma_3$ and $I_1 = I_3$

## $n^2$

## $\frac{1}{n}$

## $n^3$

## Independent of n

## 4.35 eV

## 1.51 eV

## 3.4 eV

## 6.8 eV

## B' will be minimum and in C' maximum

## A' will be maximum and in C' minimum

## A' will be minimum and in B' maximum

## C' will be minimum and in B' maximum

## $F_e = F_n$

## $F_e >> F_n$

## $F_e << F_n$

## $F_e$ and $ F_n$ differ only slightly

## An atomic electron is ejected

## An electron which is already present within the nucleus is ejected

## A neutron in the nucleus decays emitting an electron

## A proton in the nucleus decays emitting an electron

## Q50. A radio-active elements has half-life of 15 years. What is the fraction that will decay in 30 years?

## 0.25

## 0.5

## 0.75

## 0.85

## 220 V

## 110 V

## 0

## $220\sqrt{2} V$

## P = 1, Q = 0

## P = 0, Q = 1

## P = 0, Q = 0

## P = 1, Q = 1

## An anti-particle of electron

## A vacancy created when an electron leaves a covalent bond

## Absence of free electrons

## An artificially created particle

## 25 sec

## 60 sec

## 12 sec

## 10 sec

## $30^\circ$ towards East

## $45^\circ$ towards East

## $30^\circ$ towards West

## $45^\circ$ towards West

## T

## $T-\frac{mv^2}{l}$

## $T+\frac{mv^2}{l}$

## 0

## $t^{1/2}$

## t

## $t^{3/2}$

## $t^{2}$

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